Cisco :: Designing A Network Using Subnets?

May 5, 2011

I recently added a post lately referring to drawing a topology of a large network with a high number of hosts. Now with project itself, I'm designing a network for a large organisation with a different number of hosts at each location.These are, 500,18,52,236 and 12. The location with 500 hosts is the head office, to which every other branch has a wide area network connection through a serial link.How many subnets would I require? I wrote down subnet details, but only for 5 subnets, a subnet for each location. Is that all I need? Or do the WAN connections count as subnets

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Designing A Small Home Network

Mar 7, 2012

I need to connect 4 desktops wired 2 laptops wireless, one led TV wired.I have beam 10mbps internet and I want to share it to all devices.I want one desktop to act admin for internet sharing on all other devices.

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Cisco :: Designing Hierarchical Network - 300 Computers?

Apr 8, 2013

i am creating a network using the hierarchical for a small to medium business. basically i need, file server, sql database, web server, account server, app server, back able to use a phone. the network will have around 300 computers

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Cisco Application :: ASA 3750 - ACE Routing Mode Designing

Mar 12, 2012

clients ---asa--3750--cisco ace--- servers behind vip
|
visa card transaction servers

I am able to setup a vip on ace using routing mode on ACE,as the  servers need to see the client ip ,so we are not  performing SNAT,this  part is working fine.
 
when a request comes from the client ,it goes to the vip and to one of the backend servers ,and the request will be forwaded back to the ace ,as the default gateway on the servers is pointing to the server vlan on ace.
 
but if the transaction from the servers need to go to the visa card transaction servers ,how can we acheive this ,and after fetching the data from visa servers,does the reply will be fwd to the ACE or ASAs directly.

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Cisco Wireless :: 5508 WLC Designing - Interfaces And VLans

Oct 8, 2012

just have  few questions about designing WLC 5508
 
The  scenario is  that currently one of the client has a firewall Tie ring T1 internet facing and T2 internal which has multiple DMZ connected.
 
T2 firewall has a DMZ switch connected which has a router which connects to MPLS cloud to different site across the country. (around 10 sites) all static routing.
 
Now the client is thinking to deploy wireless at all 10 sites using H-REAP. The issue is that client has only one WLC and they are not willing to buy other as i was thinking to deploy two WLC one for corporate and one for guest users. (one in internal network and on in DMZ)
 
Now my question is as follow.
 
1- Keeping in mind that there is only one WLC where should i physically put it?
2- How guest users will work ? How the authentication will be done?
3-There are 8 SFP ports in WLC how physical topology will look like?
4-How many Vlans i have to make for wirless users  will that be 10? (1 at each site) ?
 
my last question is that how these ports work on WLC are they just like switch e.g  one port can be assigned to different vlan....just confuse about interfaces and vlans on WLC (interfaces concept)

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Cisco Firewall :: ASA 8.4 / NAT Some Subnets To One IP And Other Subnets To Another IP?

Aug 15, 2012

I need to NAT some subnets to one IP and other subnets to another IP. The range command want work because some of the subnets are out of order.For example  subnets 192.168.1.0 - 192.168.7.0 and 192.168.25.0, 192.168.28.0 nat'd to 1.1.1.1.  subnet 192.168.26.0-192.168.27.0 nat'd to 1.1.1.2

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Split Network Into 3 Subnets?

Oct 9, 2012

I need to split a network: 10.0.4.0/24 into 3 subnets with the following hosts per subnet:

Subnet 1: 80 hosts
Subnet 2: 10 hosts
Subnet 3: 120 hosts

split into 3 subnets?

Im thinking something like this:

Subnet 1
Network 10.0.4.0
Subnet Mask 255.255.255.128

[Code].....

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Two DHCP Servers On Different Subnets Same Physical Network?

Aug 14, 2012

I've done a very crude drawing of the network setup I'm working on. I just need to run an idea past some network guru's to see if I'm right about my idea.

The existing network consists of

Internet
Proxy Server
Several switches scattered around school
PC's

What the school wants to do is setup a side-along wireless network that uses the same physical switches but on a different subnet. The current subnet is 10.172.1.x .

To facilitate this I'm running a 2008r2 running RIP V2 to route internet traffic to 192.168.1.x subnet. I've had the wireless units use a static address and their own dhcp servers on the 192.168.1.x subnet. Wireless devices found their way to the internet fine. But I'd like to control the addresses from a single point of contact, hence the 2nd domain server running 2008r2. There are reasons for using a 2nd server, I've covered this in previous topics. If it's important, lets call it an intellectual exercise and leave it at that.

The question(s) : If I run a DHCP server on the 2nd server serving 192.168.1.x addresses, then any device on the physical network will obtain either an 192. or a 10. address correct ? The wireless devices will only take a 192. address because the wan address is statically assigned to a 192. address ?

The 2nd question : By setting a static routes out of the 2nd nic on the 2nd server, I can control the dhcp server so it will ONLY route dhcp requests to the statically assigned wireless devices ?

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Home Network :: Connecting Different Subnets Without Router?

Apr 12, 2012

I have a home network. There are a total of 3 PCs. Each runs Server 2008 32 bit. One PC - Lets say Server A has 2 NICs with Ip addresses, 10.0.0.10/30, 10.0.0.2/30.Other two computers Server B and Server C have single NIC with addresses 10.0.0.1/30 and 10.0.0.9/30 resp. So as you can see that there are two subnets 10.0.0.2 - 1 and 10.0.0.9 - 10. I can ping B and C from A. I want that B and C can also ping each other and if I run tracert on B or C, it should give me the route to the destination via A. All this without any other hardware. Like using route add... etc eg. if I write tracert 10.0.0.9 on B, it should return a route like 10.0.0.1-----10.0.0.10------10.0.0.9. Refer to the image that I have Attached

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How Many Bits Must Be Reallocated From Host ID To Network To Create 16 Subnets

Jun 30, 2012

How many bits must be reallocated from host ID to network ID to create 16 subnets?( i did read the discussion on another page and still no clue). For the Class C network address 192.168.10.0 , which of the following subnet masks provides 32 subnets? How many host bits are necessary to assign addresses to 62 hosts ??

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Home Network :: Advanced Home Network Setup (3 Subnets) And Port Forwarding?

Feb 24, 2013

I have a Time Warner Cable business class service with no static IP, with a wireless modem which is plugged to a CAT5 distribution panel. On the jacks (2 other rooms on the house) I have a Linksys E3000 and a Linksys Valet router for signal boost and gadgets usage (TV, cameras, etc).The main router (TWC) has it's own external IP which TWC assigns to me and internally distributes via DHCP the range 192.168.0.x. With that said:

- The E3000 has a 192.168.0.6 IP -- this is fixed setup on the TWC router (ubee brand) by MAC address
- The Valet has a 192.168.0.7 IP -- this is fixed setup on the TWC router (ubee brand) by MAC address
- The main router has the 192.168.0.1 as the gateway and web-interface

Whenever I connect something to the E3000, it is distributing the 192.168.1.x range and the valet 192.168.2.x range.That works perfectly for my home based business until I decided to use more stuff on the network such as a IP printer, IP cameras, etc.

- The IP cameras are connected to the E3000 due to signal strength and I have manually assigned them the 192.168.1.15 and 192.168.1.16 IPs and ports 9001 and 9002.

- The printer is connected to the E3000 and I have manually assigned the IP 192.168.1.30.

Issue 1: Port forwarding On the main router (TWC - UBEE) I have tried to setup a port forwarding by informing the Local IP as 192.168.0.6 (E3000 IP), Internal Port 0, Public Interface IP (0.0.0.0), Ext Start Port 9001, Ext End Port 9001, Protocol - Both, Enabled Yes. On the E3000 I did the same config (screen shot attached e3000.png).This is not working properly. I can't get into the camera.

Issue 2: Printer/ The printer is only accessible if I connect to the E3000 (because it is on the 192.168.1.x network)

Issue 3: How to configure all the devices on the same subnet? If I want everyone to be on the 192.168.0.x network, how to configure properly the E3000 and the Valet? I have tried to force them into the same network but it would not work properly. It would not get an IP from the UBEE router (main).

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Cisco Firewall :: ASA 5520 - Allowing Guest Wireless Network Access To Internal Subnets

Jan 23, 2012

We have a Cisco wireless infrastructure in place that includes a guest network with its own subnet that is a sub interface of the inside interface on our ASA 5520.  There are no routes for it to be allowed access to the internal subnets.  So it can only access the internet.  This is primarily used by the public, but we have several non employee personnel that we only want to give internet access and force them to access the internal network through our clientless SSL vpn portal or through other internet facing internal resources such as webmail.I have done packet traces from within the ASA and the break appears to be there is no ACL allowing the traffic back into the network once the web resource replies to the request and the traffic is attempting to come back into the network from the web resource.  Is that as clear as mud?
 
I know that this has to be a common problem and a way around this is to allow the guest wireless network access to the internal network but only for the select resources that they require.  And that this can be done seemlessly by network specific routes and or alternate DNS entries, but I would like to keep this simple and just allow them to access the web resource, webmail and VPN, from the guest wireless using internet DNS servers without route trickery.

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Connection Between Two Subnets

Apr 12, 2012

I have a home network. There are a total of 3 PCs. Each runs Server 2008 32 bit. One PC - Lets say Server A has 2 NICs with Ip addresses, 10.0.0.10/30, 10.0.0.2/30. Other two computers Server B and Server C have single NIC with addresses 10.0.0.1/30 and 10.0.0.9/30 resp. So as you can see that there are two subnets 10.0.0.2 - 1 and 10.0.0.9 - 10. I can ping B and C from A. I want that B and C can also ping each other and if I run tracert on B or C, it should give me the route to the destination via A. All this without any other hardware. Like using route add... etc eg. if I write tracert 10.0.0.9 on B, it should return a route like 10.0.0.1-----10.0.0.10------10.0.0.9.

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Two Subnets Across Same Link

Aug 24, 2012

I have two subnets, that need to share a common link, and each with its gateway at the opposite end. What kind of switch do I need for the two red boxes?

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Same MAC Addresses In Different Subnets?

Nov 20, 2012

I have an exercise with picture you find below. The question is: Will the network shown in the diagram work correctly when you consider that the MAC-addresses PC0 and PC8 are the same, and why?

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How To Connect Two Subnets

Mar 26, 2013

I have 2 DSL Lines going into a load balancing router. The load balancer is set up to distribute the traffic equally on the two lines, hence doubling the bandwidth. Though great at load balancing, it cannot handle DHCP for the 50+ users on our network, and therefore we are using another router for DHCP, which is running DD-WRT firmware.DSL 1 - 10.1.0.1DSL 2 - 10.2.0.1Load Balancer - external 10.1.0.2, 10.2.0.2 internal 192.168.10.1. DHCP Router - external 192.168.10.2, internal 192.168.1.1All other devices - 192.168.1.xThe load balancer has many options to direct traffic to one WAN port or the other based on IP address, which we would like to implement. But right now, since all my devices are on the 192.168.1.x subnet, it can't see anything but the DHCP router. So essentially it thinks it has only one client.

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Cisco :: Communication Between Subnets On 5510

Sep 13, 2011

I am working on a Cisco 5510 with multiple interfaces and requirements. I have experience with Cisco IOS, but not too much with the ASAs. I seem to be getting a bit confused on the NATing and ACLs on a firewall that was started by another employee, who is no longer here. With my current config I can get the firewall in place (we are currently using an older PIX) and most basic functions work except for two key things: 1) communication from the finance interface to the inside interface. The finance subnet has some restrictions that you will see in the ACL- we are trying to limit connections to the those systems, but they need to be able access an e-mail server on the inside. 2) communication from the DMZ interface to the inside interface. Maybe related to the first problem?

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Cisco :: Multiple Public Subnets On Asa

Mar 2, 2012

I've currently got my ASA (5505) serving a /28 public subnet. I've ran out of IPs, so my DC has issued me an additional /24 subnet that they have routed to my ASA. What needs to be done on my ASA so be able to use these new addresses? I've been trying to search and not been able to find a good answer (some say I shouldn't have to do anything, everything else references NATing, which I currently don't do and would rather not do).The servers I assign these to, I'd like them to have the public ip assigned directly to them.

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Cisco :: VPN Can't Access Subnets Behind 2nd Router

Mar 11, 2012

I purchased an ASA 5505 and placed it between my Cable Modem and Cisco 3745 router. The outside interface on the ASA is dhcp, the inside interface is 192.168.100.1. The outside interface of the 3745 is 192.168.100.2 and the inside is 192.168.1.1. The VPN pool is 192.168.200.10 - 192.168.200.10.

1. When I establish a VPN session to the ASA, I can ping and access any resources dierectly connected to the ASA's interfaces and on the ASA's internal 192.168.100.0 network. However, I cannot access any resources behind the 3745. I cannot even ping 192.168.1.1. Even directly connected hosts on the ASA cannot access Hosts in the 192.168.1.x subnet. There appears to be no traffic between 192.168.100.0 and 192.168.1.0.

2. Although I believe that I sent up split-tunnel, I cannot U-Turn back to the internet once connected to the VPN.

Here is my network topology as well as my ASA config and Router config.....

ASA ......
ASA Version 8.2(5)
!
hostname poog-fw1
domain-name poog

[code]....

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Cisco :: Connecting 3 Subnets On 1 Switch?

Mar 31, 2012

I have 1 Cisco switch 24 ports and 12 computers. The 12 computers are divided in three groups and every group is a different network segment.

question 1: I need that every group has communication with its own set of computers but no communication with the computers on the other segments.If I connect the computers to any port on the switch, can they communicate within its own groups? Can the switch pass the network traffic for all of them?

question 2; What I need to do on the switch to have them to reach the internet?

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Cisco LAN :: Connecting 2 Subnets Using 2921?

Feb 12, 2013

I have a cisco 2921. I have 2 networks that has its own router
 
192.168.1.0 network is connected to watchguard firewall 192.168.9.0 network is connected to the cisco 2921 router.
 
I want to connect the 2 subnet using one of the interface of the cisco router. How I can get this work? It is not connected via vpn tunnel but we want to have LAN speed when accessing resources on both network. Each network is connected to a dell switch.

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Cisco :: 5508 Will Not Discover AP's On Other Subnets

Nov 8, 2011

I have a 5508 controller that has 14 APs connected to it. I installed them without an issue. The 2 new APs are on a different subnet. I can ping them from the 5508 controller ping command, but they do not self discover from the web interface. The 2 new APs are at a differnet physical location.

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Cisco VPN :: ASA 5520 Not Processing RRI Subnets

Jun 18, 2012

I am coming to this forum because TAC and several CCIEs are having trouble finding me a solution to my problem.
I have Two 5520s each running 841 connected in two different data centers with two different internet providers. I have 100+ 5505s that have the capability to connect to either 5520 via EZVPN to either 5520. Up to now there has not been a need for a 5505 connected to one 5520 to talk to another 5505 on the other 5520. Each 5505 accesses network resources as in any enterprise network. Our company recently started telecommuting and I have been giving 5505s and a VOIP phone out to people. What was discovered is, if you are on one 5505 connected to a 5520 and the other 5505 is connected to the other 5520 the audio in voip does not work. If both the 5505s are connected to the same 5520 than everything works fine. Conversely a 5505 on one 5520 cannot ping a 5505 on the other 5520. 5505s on the same 5520 can ping each other no problem.
 
My problem: All 5505's are configured for a 172.18.xxx.xxx  255.255.255.224 subnet. This subnet is not used anywhere else. So I have a 100 Class "C" subnets carved up into 255.255.255.224 networks. If I look at a specific route for a subnet on one 5520 I see it pointed to the outside interface via RRI. I can look for the route in the 5520s connected CORE switch and I see the route pointed to the 5520. We have a fiber connection to the CORE in the other data center. The route is in this CORE switch as well. When I look for the route in the 5520 connected to this core it is not there. I have all other routes visible but not this particular route which should show on the inside interface. All I show on the 5520 are the 5505s connected to this ASA. So the 5520 is not processing the RRI subnets from the other 5520 and vise versa. Thats why a 5505 on one 5520 cannot ping a 5505 on the other 5520. I only see 172.18.0.0/27 on the outside interface of both 5520s. I do not see any 172.18.0.0/27  on the inside interface on either.
 
I have had numerous TAC cases open on this and no one seems to either understand my problem or have a solution for me. My local sales rep CCIE says the problem looks like a bug in 841 (which I am running) and that the ASA is not processing RRI from eigrp which I am running as well. The whole network is running the same instance of EIGRP including the 5520's.
 
My questions:
1) Is it possible the 5520 is not allowing 172.18.0.0/27  on both the outside and inside interface? Even though all subnets are masked proper the ASA maybe thinks it is being spoofed? I have not been able to confirm this using the real time log.
2) Could this really be a bug? I have looked at all the release notes and have not found anything resembling my problem. TAC has not recommended that I upgrade or downgrade my IOS.

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Cisco Switches :: SF-300 24 - 2 Subnets And Uplinks

Oct 6, 2011

I have 2 sub nets and 2 up links
port g1 = 211.122.10.x
port g2 = 210.211.10.x
 
Can use 1 switch (sf-300 24)
assign port 1-12   up/down to g1
assign port 13-24  up/down to g2

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Cisco Routers :: RV082 NAT To Other Subnets?

Jan 12, 2012

Is it possbile to NAT to other subnets with the RV082. It is on a 192.168.41.x and I have a phone system on a 192.168.20.x. After searching all over others are saying no.

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Cisco :: 2504 - Wi-Fi Management Across Different Subnets

Jul 29, 2012

Is it possible to use a 2504 wifi controller to manage compatible AP's across different subnets ?

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How To Find Out Range Of Subnets For Given IP

Jul 7, 2011

if some gave me an IP address and subnet mask, and they told me to identify the range of valid subnets I have no clue how to do it. I know how to work out the total number of subnets and hosts, you just look at how many subnet bits have been borrowed and use the 2^ formula. For example with the IP 172.28.123.0/25 I know the default mask for a classs B address is 255.255.0.0/16 so in this example we have borrowed 9 subnet bits to give mask of 255.255.255.128/25 and 7 host bits remain. In order to find the total number of subnets you do, 2 to the power of 9 because we borrowed 9 bits, which tells us that there's 512 subnets and to find out how many hosts we do, 2 to the power of 7 because we have 7 host bits, so that gives us 128 hosts in each subnet. Now this is where I get lost, how do I find out the number of the first and last subnet? I know there's 512 subnets and each subnet has 128 hosts. But I don't know the number of each subnet, the range to be more precise. How do I workout the first, second, third, fourth etc subnet address

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Connecting Two Subnets At Layer 2

Jul 2, 2012

I have :

- two different subnets (S1, S2)

- these subnets are connected to an IP backbone via wirelles acces points

I would like to physically connect these subnets together so the networks devices in S1 could directly communicate with the devices in S2 and vice versa without going through the backbone.

The obvious solution seems to interconnect these subnets with a router or a switch L3. But I would like to connect these subnets and stay at layer 2.

So, is it possible to connect S1 and S2 with a switch L2 ? If I do that, what is going to happen? Can I create just one subnet S3 from this two subnets when I connect them together and have my two separate subnets back as soon as I disconnect them?

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Folder Sharing Between 2 Subnets?

May 11, 2012

our office has 2 branches recently the static ip of the branch was changed to a different subnet. earlier it used to be

111.170.150.140 subnet mask (255.255.255.128) main branch router (1) ip which forwards all request to server (dmz) - unchanged

111.170.150.141 subnet mask 255.255.255.128 sub branch (2) router ip changed to 111.170.150.61 subnet mask 255.255.255.224

after this change i am not able to access shared folders on the dmz server (1) (111.170.150.140). i am able to ping the ip and also able to open remote desktop connections from sub branch (2).i suspect that it is because of subnet change as i was earlier able to access shared folders?How can we access the shared folders across the subnet? what settings to change?

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Making 4 Subnets For VLANs?

Dec 4, 2012

You have to make 4 subnets for 4 VLANs, the router interface assigned to each VLAN is the LAST usable host on the subnet.so unless I'm really bad at networking the graph should be:

NET ID // HOSTS // BROADCAST ADDRESS // VLAN

192.168.0.0 // 192.168.0.1 - 192.168.0.62 // 192.168.0.63 // VLAN1
192.168.0.64 // 192.168.0.65 - 192.168.0.126 // 192.168.0.127 // VLAN2
192.168.0.128 // 192.168.0.129 - 192.168.0.190 // 192.168.0.191 // VLAN3
192.168.0.192 // 192.168.0.193 - 192.168.0.254 // 192.168.0.255 // VLAN4

So if I'd have to write down a single host configuration for VLAN2..I think it should be:

IP: 192.168.0.65
subnet mask: 255.255.255.192
default gateway: 192.168.0.126

Is this correct? I'm not sure whether the default gateway should be 192.168.0.255 (as would with normal subnets) or as I wrote down 192.168.0.126, this is the first time i've ever gotten assignments including VLANs and I havn't really gotten a solid explanation.

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Cisco :: Local Subnets Can't Browse Each Other (but Can Ping Ok)

May 21, 2011

I just installed a new ASA 5505 for an office with three internal subnets.* The three networks can each get online fine and ping eachother, but cannot browse to shares on the two internal networks other than their own.* How do I configure the ASA to allow all traffic between these three inside networks?

192.168.152.0
192.168.152.0
192.168.154.0

[code]....

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Cisco :: SG200-08 Setting Up Multiple Subnets

Aug 26, 2011

I am setting up my home lab to practice and play around.I have VMWARE ESXi environment with two workstations as my servers.I would like to setup two domains with two domain controllers  but i want each domain to have its own subnet.So this is my setup. I have Cable modem from cablevision , thay connects to my router which is Apple Airport which acts as the DHCP server. DNS server and default gateway. The network on the router is 10.0.1.xThen i have two switches . One is a 5 port unmanaged switch that connects to the three physical desktops .Then i have a Cisco small business switch SG200-08 that connects to my ESX servers and NAS. Now currently all is good and working but like i said all my machines physical or virtual get an IP that is 10.0.1.x and they get all this from the router. And i think i can setup two domains with two domain controllers without an issue and they will all get an IP address of 10.0.1.x. This is all good but i want to have one domain on one subnet and other on another so for example one domain will have 10.0.1.x and other 10.0.2.x. I am just not sure what i need to to  get this setup like this. I know my SG200-08 supports vlans and i am pretty sure on the apple router you can only have one subnet i think. So can i do this with my current setup by setting up a DHCP server with two scopes ?

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Cisco Routers :: RV042 With Two Subnets For A Web Server?

Dec 21, 2011

I have a static DSL  connection and my ISP is giving me 4 static IP's. I have connected my  RV042 to the DSL modem and I have now 1 subnet at 192.168.0.0. What I  want to create is a WEB server/ Email server, but to sit on a different  subnet - 192.168.5.0. For now I have connected the server to the DMZ  port, but I am unable to to access it from WAN, only from LAN. How to configure properly the 2 subnets (192.168.0.0 and  192.168.5.0) and how to forward my static address to the server which I  which to be on the 192.168.5.0.

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