Cisco :: Multiple VLANs Inside The Same Subnet?
Apr 4, 2013
The network topology is like this. Router with DHCP_Server on it.
VLAN 10
VLAN 20
VLAN 30
My question is how to configure the router so that all devices on all 3 VLANS can obtain IP from the router. I've tried to enable proxy arp on all interfaces and create sub interfaces and trunk them to their appropriate vlans, but I can't specify the gateway on all trunked sub interfaces because I get a warning that addresses overlap. Then I tried to set access-group on all sub-interfaces and still doesn't work.
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Apr 1, 2013
I have a home office with multiple VLANS/subnets I have many VPNs that connect only a specific subnet to a specific remote offfice. On a 5520, can I create a S2S VPN to different remote offices that have the same IP scheme, but from different home office subnets? For example at my home office let's say I have two independant, distinct VLAN/subnets: 192.168.140.0/24 and 192.168.150.0/24. Can I create an S2S from the 140 subnet to a remote office with a 10.10.10.0 addressing scheme and another S2S from the 150 subnet to a totally different office also with a 10.10.10.0 scheme?
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Nov 17, 2011
The ASA device is going to be the gateway for multiple distinct inside IP subnets. We can have have a unique outside IP address to correspond to each inside IP subnet if needed, but we need some means for a VPN client or a site-to-site VPN to have acess to a pre-definied IP subnet (i.e. if customer A establishes a VPN connection, they have connectivity to IP subnet X; customer B establishes a VPN connection, they have connectivity to IP subnet Y, etc.).Currently, the two inside IP subnets are 10.10.0.0/16 and 10.20.0.0/16. We will be adding more.The problem we are facing is that we cannot reach the VLAN 201 from the ASA we believe this is because. I have setup two addresses on port 0/1 Vlan1, 10.10.20.2 and 10.20.20.1 as an alias. How can we make traffic for the 10.10.0.0/16 subnet untagged and traffic for the 10.20.0.0/16 subnet tagged for VLAN 201.
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Oct 21, 2012
how i can configure a second ssid for guest access in our environment. this is our network setup prior to this request: Internet----Firewall (not ASA)---ce520---C1131AG and CME router is also connecting to the ce520 switch. we only have two vlans: one for voice and two for data.
Presently, there is no vlan configured on the AP because it on broadcasting ont ssid and wireless users gets IP from a windows DHCP server on the LAN. the configuration on the ce520 switch port for the AP and other switches say access vlan is the DATA vlan which automatically becomes the native vlan for all trunk port connecting the AP and other Stiches to the network.
Now with this new requirement, i have made my research and i have configured the AP to broadcast both the production and the guest Vlans. The two vlans are 20-DATA and 60-Guest. I made the DATA vlan on the AP the native vlan since the poe switch is using the DATA vlan as native on the trunk ports. I configured the firewall to serve as DHCP server for the guest ssid and i have added the ip helper-address on the guest vlan interface on all switches while the windows server remains the dhcp server for the production DATA Vlan. I have confirmed that the AP, switches can ping the default gateway of the guest dhcp server which is another interface on the firewall. I can now see and connect to all broadcasted ssids but the problem is I am not getting IP addresses from both the production dhcp server and guest dhcp server when i connected to the ssid one at a time. My AP config is attached below.
Do i need to redesign the whole network to have a native vlan other nthan the data vlan? Does the access point need to be aware of the voice vlan? Do the native Vlan on the AP need to be in Bridge-group 1 or can i leave it in bridge-group 20?
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Sep 18, 2012
My question is if I can configure 3 ssid, for 3 different VLAN and add the DHCP address from a WAP4410N AP, when you upgrade to the latest version of IOS I can have this functionality?
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Mar 9, 2010
Is it possible to have multiple dhcp pools for multiple VLANs? The switch is a 6509 and/or 4506 catalyst. I don't want to use server-based products.
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Jul 7, 2012
I've setup a SSL VPN to a ASA 5505 and can connect.
VPN network 192.168.2.0 /24
Inside Network 192.168.1.0 /24
Outside is connected to Router.
I am trying to RDP to a win server on the inside network but I cant get to it. Can not even ping 192.168.1.1 or (not sure if I could anyways) 192.168.2.1...
I added a ACL on the outside interface and then inside interface permit ip any any but still no ping or RDP...
New at VPN and have survived so far on cisco docs but this problem is evading me.
: Saved
:
ASA Version 8.2(5)
!
hostname ciscoasa
[Code]....
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Jul 6, 2012
I've setup a SSL VPN to a ASA 5505 and can connect.
VPN network 192.168.2.0 /24
Inside Network 192.168.1.0 /24
Outside is connected to Router.
I am trying to RDP to a win server on the inside network but I cant get to it. Can not even ping 192.168.1.1 or (not sure if I could anyways) 192.168.2.1...I can ping from the 192.168.1.0 net to 10.0.0.0 and 192.168.2.0 without issue but not the other way around....I added a ACL on the outside interface and then inside interface permit ip any any but still no ping or RDP...
: Saved
:
ASA Version 8.2(5)
!
hostname ciscoasa
enable password 2KFQnbNIdI.2KYOU encrypted
passwd 2KFQnbNIdI.2KYOU encrypted
[code]....
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Mar 8, 2011
I have setup two different subnet 192.168.1.0 and 192.168.2.0 on the same 'inside' interface. They are unable talking to each other. I can ping from firewall to both subnet. Both side unable talking to each other unless I add route on the both side systems.I have added the followings in ASA5510. [code]
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May 25, 2011
How to configure dynamic VLANs (IP subnet-based) using Nortel JDM? My company is now using port based VLAN and it wastes a lot of time reconfiguring the port to its VLAN everytime their devices moved from one place to another place. So I think using IP subnet-based VLAN might solve the problem?
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Sep 16, 2012
I have a 5505 with Base license running ASA software v8.4(2) that has been working happily for a while with an inside and an outside VLAN.
The outside has a single statically configured public IP, and I have a number of static NAT rules to expose a few internal servers as well as Dynamic-NAT for all devices on inside to gain access to the Internet... the main bits of the config are below:
interface Vlan1
nameif inside
security-level 100
ip address 192.168.1.1 255.255.255.0
!
interface Vlan2
[code]....
I now have a requirement to add a "dmz" VLAN for guests to have access to the Internet using a dedicated wireless AP, but not to any of the inside resources. As the ASA has a base license I have configured "no forward interface" to the inside vlan, which suits the purpose fine
interface Vlan12
description Used only for guests access to the Internet - no access to the corporate resources
no forward interface Vlan1
nameif guests
security-level 20
ip address 192.168.2.1 255.255.255.0
My problem is that when I try to add NATing from the dmz to the outside I get a:
ERROR: Address a.b.c.d overlaps with outside interface address.
ERROR: NAT Policy is not downloaded
with either:
object network guests_subnet
subnet 192.168.2.0 255.255.255.0
nat (guests,outside) dynamic interface
[code]....
Having had a look at the ASA Configuration guides, all the examples I can see with several "internal" VLAN's being NAT'ed use one external IP per VLAN - is this a feature/restriction of the ASA software? Are there any workarounds? Or is the overlap in the error message really about the current NATing to the inside VLAN which is done on the "any" 0.0.0.0 subnet - would the following then work:
object network obj_any
subnet 192.168.1.0 255.255.255.0
nat (inside,outside) dynamic a.b.c.d
object network guests_subnet
subnet 192.168.2.0 255.255.255.0
nat (guests,outside) dynamic a.b.c.d
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Jul 3, 2012
We have 2xASA5510. I have 2 Inside interfaces as INS_STAFF and INS_QUEST and two Outside interface OUT_STAFF and OUT_QUEST which is in sapareta ISP's. All interfaces is assinged to different vlans. now i want to nat INS_STAFF to OUT_STAFF and INS_QUEST to OUT_QUEST,because I'm having two default routes it gets impossible to do. Plus I want to make failover with my ASA's. I know that i can solve this problem with PBR on router.but I haven't it . make context's and separate each Inside and Outside alone?
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Nov 27, 2012
On an 887VA running 15.x IOS, is there a way to support both public and private addresses on inside vlans? The outside interface is public static ip, so the requirement would be to not nat anything if coming from inside vlan10 but nat if coming from inside vlan20.I didn't think this was possible since the outside interface would have to use an outside nat command that would not be ignored for traffic coming from vlan10.
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Aug 24, 2011
I have a RV042 with multiple subnet, 192.168.10.0 and 192.168.9.0. 192.168.10.0 is assigned to the LAN, 192.168.9.0 is created under multiple subnet. Both subnet can access Internet by accessing IP address, but 192.168.9.0 cannot access Internet by using host name. It looks like DNS is not working for the 9.0 network.
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Apr 4, 2011
I am designing a network right now that is going to have 356 devices. I need to use vlan separation with subnetting for a number of reasons. The first (and most obvious) is that there are 356 devices that will require an IP. Too many for one subnet. The second is that a good portion of the devices that I am using are a litlle to chatty with the broadcast traffic for my comfort. I have two subnets that are going to be specifically alocated to these chatty devices. Our switches are being provided for us by the client for unknown reasons. They are providing us with HP ProCurve E2810 switches which are layer2 switches.
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Sep 27, 2012
I'd like to set each individual LAN port with different address i.e. LAN 1 192.168.1.1 and LAN 2 10.1.1.1 instead of using the multiple subnet feature and having all ports replying for the addresses created.
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Dec 15, 2010
I have an 1811 as a border router. Initially we had one block from our ISP. We just got a second block of IP's and I'm not sure how to make this work.
Block #1 - Working
209.91.**.129-142 /28
Block #2 - Not Working
209.91.**.146-158 /28
The problem I'm having is block #1's gateway is 209.91.**.129 and block #2's is 209.91.**.145
How do I make it so I can use both blocks in my NAT entries?
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Jun 23, 2011
NAT command on 8.4? I am trying to PAT multipule Inside subnets to an IP address. With the example I found I can only PAT one subnet. If I do it the way I have below, it will end up with the last subnet (3.3.3.0) stay in the config. What is the best way of doing it? I have about 20 inside subnets I need to PAT.
object network obj-Inside-sub1
subnet 1.1.1.0 255.255.255.0subnet 2.2.2.0 255.255.0.0subnet 3.3.3.0 255.255.0.0nat (inside,outside) dynamic 199.246.5.2
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Mar 9, 2012
I'm trying to get my ASA 5505 (IOS 8.4) to work, but got stuck on NAT because I would like to allow 3389 access for just a couple of WAN IP's. This is what I found so far:
(config)# object network Internal_RDS(config-network-object)# host 192.168.1.10
(config-network-object)# nat (inside,outside) static interface service tcp 3389 3389(config-network-object)# exit
(config)# access-list inbound permit tcp any object Internal_RDS eq 3389
(config)# access-group inbound in interface outside
But this will allow all WAN IPs to access 192.168.1.10 over port 3389 I guess? I would like to allow only some WAN IP's
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Jul 7, 2012
How to configure traffic flow between computers inside VLANs and a routed port? Here is the setup details:
1. Switch 3750-X
2. VLAN 100 - ( SVI IP address 192.168.100.1 /24)
3. VLAN 200 - ( SVI IP address 192.168.200.1 /24)
4. routed port gi1/0/48 (IP address 192.168.150.1 /24). Note: this port is directly connected to a firewall ASA 5520 port IP 192.168.150.100 /24
Ip routing is enabled on the switch and inter vlan traffic is flowing ok. I can ping the routed port gi1/0/48 from any computer connected in the VLAN 100 or 200. For example computer with IP 192.168.100.25 can ping the routed port 192.168.150.1. Switch can ping firewall port 192.168.150.100 and the 'sh ip route' command shows the network 192.168.150.0 /24 as directly connected network.
any computer in the two VLANs CANNOT ping firewall ASA port 192.168.150.100 Is it because inter VLAN routing does not work with a routed port on L3 switch? I looked up fallback bridging, but it is meant for non IP traffic.The goal is I am trying to set the ASA port as an internet gateway for VLANs.
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Sep 16, 2012
I have an ASA which is managing internet access from mutiple VLANs configured on a 3560 switch. I want to be able to limit the 100MB internet connection on the ASA on a per subnet (VLAN) basis for the multiple subnets configured on the switch..
so for example
VLAN10 - 10.0.10.0 - limit to 5MB
VLAN20 - 10.0.20.0 - limit to 10MB
VLAN30 - 10.0.30.0 - limit to 3MB
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Jan 25, 2012
I recently bought SG-300 28P to create the VLAN. My network hs 3 subnet 192.168.1.0, 192.168.2.0 and 192.168.3.0.My main net work is 192.168.1.0. I want to divide it to VLAN to eliminate the boardcast storm; especially from the domain 192.168.3.0
But I want all the devices from 192.168.1.0 to access other subnet.
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Sep 23, 2011
I have an ASA 5505 running 8.2(1), that is configured with three interfaces as follows:
Inside (security 100) 10.0.0.0 /24
Inside 2 (security 100) 192.168.0.0 /24
Outside (security 0) internet
Inside is connected to my internal network, inside 2 is connected to the network of a sister organization, outside is outside.
I'd like to be able to route between from inside to inside 2, and have NAT translate me to inside2's address.
I have inter-interface traffic configured, and when I use a NAT exemption, I can route fine. But the resources on network 2 must see my request as coming from the inside2 interface IP.
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Jan 26, 2013
How to configure DHCP server if i have 2 vlans. I know how to configure rest of the network, just i don't know server.I use packet tracer and i attached file with my network. PC1 is on VLAN1 and PC2 is on VLAN2.I want ip addresses in vlan1 to be from 192.168.1.2 and in vlan2 from 192.168.2.2. I would like to do it just like in the designed network, without router.
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Aug 26, 2012
I have 2 SG300-10 switches, and I need two VLANs, one for internal network and one for WiFi APs.I need ports 1->4 on both switches to be part of 1st VLAN and ports 5->8 on 2nd VLAN; and port 10 uplink to 2nd switch.How I set up the VLANs and interface VLAN mode?
[code]...
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Jun 17, 2012
I'm trying to setup a VPN connection for the two PC's in the graphic below. I have the link between the two locations setup and secured, now I just working with the routing elements.what I need to add to the firewall config in order to get this to work? Here is what I have:
SITE A------access-list mpls_vpn_sitea extended permit ip host 172.168.199.1 host 172.168.199.2 access-list mpls_vpn_sitea extended permit ip TEST-LOCAL 255.255.255.0 TEST-REMOTE 255.255.255.0crypto map mpls_vpn 1 match address mpls_vpn_siteacrypto map mpls_vpn 1 set peer 172.168.199.2 crypto map mpls_vpn 1 set transform-set ESP-3DES-SHAcrypto map mpls_vpn interface MPLScrypto ipsec transform-set ESP-3DES-SHA esp-3des esp-sha-hmac
SITE B------access-list mpls_vpn_siteb extended permit ip host 172.168.199.2 host 172.168.199.1 access-list mpls_vpn_siteb extended permit ip TEST-LOCAL 255.255.255.0 TEST-REMOTE 255.255.255.0crypto map mpls_vpn 1 match address mpls_vpn_sitebcrypto map mpls_vpn 1 set peer 172.168.199.1 crypto map mpls_vpn 1 set transform-set ESP-3DES-SHAcrypto map mpls_vpn interface MPLScrypto ipsec transform-set ESP-3DES-SHA esp-3des esp-sha-hmac
do I need to specify a route between the two networks? What do I need to have for NAT statements?
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Oct 23, 2012
I recently set up a Cisco 881 to cover a small business network. The router is currently set up and working as expected. We recently decided to move to VoIP phones and here is where I'm running into some issues.
First an overview: We run a network with a cable internet WAN connection, this connection is DHCP, however we have a static IP through our ISP. We also have a block of 30 additional IP addresses for one to one mapping as we need them. The new VoIP system is being run over T1 lines throughout the township (we are a municipal organization) and the VoIP system is being run to about 5 buildings in the township.
This brings me to the topic of VLANs. As the phone engineer explained it to me, there is a network set up over the T1 that allows the VoIP equipment to talk to one another and operates all of the VoIP phones on one network. The equipment that is being installed at our building connects to the network over the T1 and "talks" to the other equipment on the network. The engineer wants to create a VLAN and run it on ports fa1 and fa2, with the fa2 port being connected to the actual "MPLS" (their term) that connects to the T1 and into the cloud, and the fa1 port connected to the internal phone switch.
TLDR; The problem is this: When we attempt to set up the VLAN on ports fa1 and fa2, we have no connectivity with the other units in the external VoIP cloud. Pinging while directly connected to the "MPLS" yields successful pings, while pinging from the router with the "MPLS" connected to fa2 yields failures. I'm going to post the running config below, I feel like what we're doing should be working. I asked around about subinterfacing, but others seemed to think this was not necessary.
ROUTER CONFIG
Building configuration...
Current configuration : 4909 bytes
!
! No configuration change since last restart
version 15.1
[Code].....
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Jun 22, 2011
I am having problems accomplishing these tasks with my new SG 200-18.
I have a LinkSys WRT54G2 connected to port 1. I would like ports 2-8 to be in one VLAN with access to the Internet and to be able to share their printers, hard drives, etc. with other computers on ports 2-8. I would like each of ports 9-16 to be on a separate VLAN with access only to the Internet and no other ports on the switch. I would like to be able to manage the switch from any of the ports 2-8.
After I create the VLAN 1009 (see screenshot below), port 9 can browse the Internet and cannot see the other ports on the switch which is correct. However, ports 2-8 can no longer access the switch at 192.168.1.20 in order to manage the switch.
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Apr 30, 2013
I am trying to get two external addresses to PAT to different ports on the same address in the dmz.
Object NAT is configured as follows:
object network Obj-192.168.1.20-1
nat (dmz,outside) static Obj-External-1 service tcp https https
object network Onj-192.168.1.20-2
nat (dmz,outside) static Obj-External-2 service tcp 2000 https
Obj-192.168.1.20-1 and Obj-192.168.1.20-2 contain the same host address.
The idea being that traffic destined for Obj-External-1 on port 443 will be forwarded to Obj-192.168.1.20-1 on port 443. Traffic for Obj-External-2 on port 443 will be forwarded to Obj-192.168.20-2 on port 2000.
Traffic for the first object, Obj-192.168.1.20-1, works but traffic for the second does not.
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Jan 14, 2012
I am having big problems trying to get what should be a rather simple configuration to work.I have a Cisco 2901 Router and have setup Zone Based Firewall on this.Traffic from the 192.168.223.x network does not pass through to the 192.168.1.x network.my traffic appears to disappear down the big bucket...Interesting I can ping machine on 192.168.223.0/24 network from the 192.168.1.0/24,So the static routes setup on the router on the 192.168.1.0/24 appear to be routing ok.
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Oct 10, 2011
I've been trying to figure this one out for quite a while. I currently have 2 inside interfaces (data, phone) and I am moving to 3 inside interfaces (servers, workstations, phones). I have not been able to get any traffic between the interfaces. With the current setup it was not a major problem. With the new setup it will be a major problem.
Below is a sanitized version of the config.
ASA Version 8.2(1)
!
hostname BOB
[Code].....
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Feb 20, 2008
I have two Cisco 1300's acting as bridges only. I have created an infrastructure ssid on VLAN 2 and assigned this to the radio. I am carrying multiple VLANs between the bridges (using subinterfaces on the fastethernet and radio ports).I have enabled WPA-PSK, but how do I check that this is being used between the bridges? Also - I have a switch connected at each end of the bridge. When I make VTP changes, the remote switch does not pick these up - is this because VTP goes over VLAN1 regardless of the Native VLAN (2 in my case)? Do I have to carry VLAN1 over the bridge to get VTP working, or is there an alternative solution?
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Sep 27, 2012
I have a RV180W and a EnGenius EAP350 Access Point. The EnGenius supports multiple SSID's and VLAN tags them. If port 1 on the RV180W has VLAN 1 untagged and VLAN2 tagged, any connection to the EnGenius always gets an IP from the VLAN 1, even though they are connected to the SSID which is tagged with VLAN2.
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