Cisco :: Subnetting According To Number Of Hosts VLSM
Jun 1, 2011
you can subnet to meet the number of networks required, or you can subnet to meet the number of hosts required. In which circumstances would you use either one? or are they both the same? am kinda confused.Is subnetting according to the number of hosts VLSM? and subnetting according to the number of networks required is not VLSM subnetting? Also I'm on CCNA 1 chapter 6, if the other CCNA 2, 3 and 4 has chapters explaining subnetting better cos It's totally confusing me atm.Also, is my understanding correct, when a company wants a LAN made, a network designer see's how many hosts they require in each of their LANS and then chooses an appropriate address class and subnets it? and to connect the LAN to the internet he implements NAT on the router that connects to the internet, and that router translates the internal addressing scheme that was created into a public registered IP address from an ISP? Also does he just make the address up? for example if he decides to use class C, he just picks any random number in the class C range and subnets it?
View 6 Replies
ADVERTISEMENT
Jan 18, 2012
why vlsm(variable length subnet mask) is used??Any deff. betweent general subnet mask & vlsm
View 5 Replies
View Related
Dec 13, 2011
I am looking a old exercise I did last year about subnetting and I am wondering if is possible to subnet:
198.18.9.1 /22
I wrote down, last year, that:
16 bit are assigned to network
6 to subnet
10 to hosts
when actually I see a class C ip address with 10 bit assigned to hosts. So, how many bit do I have for network, subnet and hosts?
View 2 Replies
View Related
Dec 8, 2012
I am currently trying to understand Subnetting via CCNA. My progress is going well,I understand the class below:
Class A 0-127 Max IP 2^24 = 16777216
Class B 128-191 Max IP 2^16 = 65536
Class C 192-223 Max IP 2^8 = 256
However I have seen an example from an ip calculator website, and noticed this :
Address: 192.168.1.0 11000000.10101000 .00000001.00000000
Netmask: 255.255.0.0 = 16 11111111.11111111 .00000000.00000000
Wildcard: 0.0.255.255 00000000.00000000 .11111111.11111111
=>
Network: 192.168.0.0/16 11000000.10101000 .00000000.00000000 (Class C) - I would have thought this would have been Class B?
Broadcast: 192.168.255.255 11000000.10101000 .11111111.11111111
HostMin: 192.168.0.1 11000000.10101000 .00000000.00000001
HostMax: 192.168.255.254 11000000.10101000 .11111111.11111110
Hosts/Net: 65534 (Private Internet)
Is this an invalid IP/masks as the max hosts is 65534 (which should be class B?). If so shouldnt the IP address range from 128-191- eg 172.16 (I know that CIDR is the amount of 1's. ).What calculates the class is it the netmask or the range of the first octet?
View 1 Replies
View Related
Feb 29, 2012
Why isn't it possible to make following configuration:
View 9 Replies
View Related
Apr 5, 2012
we currently use the ASA 5505 router. We would like to create another subnet inside our LAN because we are running out of IP addresses.
current subnet info:
subnet:10.1.1.X
submark: 255.255.255.0
gateway: 10.1.1.251
we want to make another subnet, which we plan to use for all our network printers for now( other use in the future) PCs at 10.1.1.X will be able to print on the new subnet. the new subnet will be able to connect to the internet.
What's the best options we can do for the subneting? how can we configure the router? is possible to set another DHCP on the new subnet. we currently have one DHCP on the 10.1.1.X
View 1 Replies
View Related
Jan 11, 2012
Given the IP address of 172.16.10.22 and the network mask of 255.255.255.240... answer the following:
What is the network address?
What is the broadcast address?
What is the valid host IP range?
What I have done so far:
Part 1 - Broadcast address
172.16.10.22 - 10101100.00010000.00001010.00010110
255.255.255.240 - 11111111.11111111.11111111.11110000
Researching different ways to find the Broadcast address I took the binary IP address and replaced all numbers with 1's for the host bits identified in the subnet mask and came up with:
172.16.10.31 - 10101100.00010000.00001010.00011111
Is that the correct Broadcast address?
Part 2 - Network address
I am not sure what is meant by the network address and all my research has come up with either MAC addresses (obviously wrong) or CIDR notation...How do I calculate the network address?
Part 3 - List of valid IP's
Using the same address 172.16.10.22/28 I did the following:
28 is closest to 32 (block wise) so 32 - 28 = 4... 2 ^ 4 = 16 (block size)
IP address listing:
172.16.0.0
172.16.16.0
172.16.32.0
172.16.48.0
172.16.64.0
and so on...
The IP address in question is 172.16.10.22 and falls in the 172.16.0.0 - 172.16.15.0 block...
Is this the correct list of valid IPs?
View 5 Replies
View Related
Sep 16, 2012
I have a slew of 106001 messages coming into ASA log, from the outside interface. it appears like most of them are for standard traffic, such as TCP 80/443. i suspect these messages are from clients on the inside who have initiated connections to the internet, but then the client abruptly terminates application of something similar. Server side finally issues a close connection, reset or something else. Here is an example, with the ASA address being 1.1.1.195 (changed to protect the innocent ).
Another theory is that the NAT ip for clients is different than the actual interface IP, so that is behaving differently. For example, once the xlate times out, the IP used for the xlate is no longer active and any return packets to the interface would also error out - be refused. If the xlate was using the interface IP, that it would always respond in some way?
I can bump 106001 down to notification (5) or informational (6) level.
View 5 Replies
View Related
Jun 18, 2012
I am in the process of acquiring a static ip address from my isp time Warner. I only want to pay for a single static, but I have a number of machines I want to put on the internet, a web server and a e-mail-server. Using a cisco router, a Cisco Rv 120w. Can I assign the static ip address my isp gave me to the Rv 120w and then crate a vlan to assign addresses to various computers. Or is this something my ISP does. I get the impression from the tech guy at Time Warner that this is something they do.
View 11 Replies
View Related
Apr 10, 2012
I wanna subnet my Network to increased performanced but im alil confused hereWhen looking at my ROUTER STATUS this is what i have.
INTERNET PORT
IP Address XX.XX.XXX.XX
gateway ip XX.XX.X.X
XX.XXX.XXX.XX
LAN PORT
ip address xxx.xxx.x.x
Which one of this ip addresses do i have to subbnet?,my router is a ,NETGEAR N600 Wireless Dual Band Gigabit ADSL2+ Modem Router DGND3700 Wireless router - 4-port switch (integrated) - EN, Fast EN, Gigabit EN, IEEE 802.11b, IEEE 802.11a, IEEE 802.11g, IEEE 802.11n.
View 19 Replies
View Related
Mar 26, 2011
I have some tunnels which terminate to my home router. I'm allowing the other ends of the tunnels to use my voice setup. I need to prepend *67 to all called numbers which don't originate from my house. I don't want people calling my home number based on the caller-id number they see when someone across one of the tunnels calls.
So if 5008 calls 212-333-4444 I want it sent to my provider as *672123334444. If 5001 calls a number, I don't want it touched. Can I do this? I can use IOS or CUCM here.
View 13 Replies
View Related
Dec 9, 2011
How to get into the ip hosts on vista?
View 1 Replies
View Related
Jun 17, 2011
So we have a cisco asa 5505. Once a day now (random times) it will suddenly be unreachable along with the hosts connected. If I console in and ping a host from the asa, suddenly it becomes reachable from the outside world again. My job prohibits me from posting the configuration online.
View 10 Replies
View Related
Jan 30, 2012
I'm new to this site, fully Microsoft certified but only just getting in cisco and looking to pass my CCNA later this year. Actual commands and general use on Cisco's im quite good at but general networking knowledge on networking (subnetting and network layers) I kinda suck at so will be studying a lot on this side of things[CODE]
View 5 Replies
View Related
Nov 13, 2012
Seems like something simple, but can't find on Cisco.com. What are the max SNMP hosts allowed on an ASA 8.2 code? That would be Polls and Traps?
View 1 Replies
View Related
Apr 14, 2013
I know that 255.255.255.255 is the broadcast address to send message to all hosts that are in LAN. what i want here is, i want to send a mail to all hosts using this address.
View 9 Replies
View Related
Jul 7, 2011
I need a tool to find all the hosts connected on my network. I need something that will tell me the MAC and host type/name. I ran an IP Address tracker and got all the IPs in use, but that doesn't tell much beyond the IP address. Don't really need to do a full in-depth nmap port scan. My concern about using nmap is it can bog down a router...Although I can't say for sure if there are ways to scale the scan back in nmap so it won't cause any issues?
View 17 Replies
View Related
Mar 4, 2011
I have several Cisco switches connecting our network. Switch N connects to the gateway, Switches Y & Z connect to some hosts. Switch N connects to Y and Y connects to Z. Assume our gateway IP is a Class B address with a netmask of 255.255.254.0 and all the hosts attached on switches Y & Z have static IP addresses assigned to them. This gateway connects to the internet.In addition to this IP address, some of the hosts also have a second IP address assigned to the same NIC. This IP is Class A (10.0.###.###) and have a netmask of 255.255.0.0 A second gateway address is not defined.
The hosts that have 2 IP's bound to their nic, use the 10. address to communicate with each other. (Programs running on the hosts are specifically configured to use 10. address).I have several questions regarding this setup:
1) Assume Host has only 1 IP (Class B) - if the destination is on the same network, does the host system send the packet to the gateway first to find the destination on the network or does the host send a "where are u" packet to the broadcast address to find the destination?
2) Assume Host as 2 IPs (Class A & B) - if the destination is a 10. address, how does the host go about finding it?
Since there is no Gateway defined for the Class A address, does the host simply send out a packet to the broadcast address for the Class A network? or does it go to the gateway defined in the Class B network as it was defined first (i'm assuming primary connection)
3) Assume Switch N's connection to Switch Y is disabled - how will this affect communication between hosts on Switches Y & Z that have a 10. IP trying to share data with each other, using the 10. Address. If the answer is this should not affect it, what additional circumstances are required that may cause the systems with a 10. address to be unable to communicate when the connection from Switch Y to N is terminated?]
View 3 Replies
View Related
Aug 1, 2011
I am working on a Perl script to be ran on our different subnets to see what hosts are down (and make the assumption that if the host is down the IP address is free to be used). This is not being ran on a Linux system, so I can't use grep to filter out everything except down hosts. I know there are modules for Nmap that would make this task easier, but my plan is to install Nmap to our network monitoring server, compile the script for Windows, and have it create the report for what addresses are down. I don't want each person running the script to have to have all the modules installed, etc. Or can you compile the script with the modules in it?
View 6 Replies
View Related
Jun 7, 2011
We have a modified hosts file on each of the computers here at work. This way we can have multi servers, in multi locations that can all be used by everyone for email & our finance program.However, there is one user who the hosts file keeps disappearing. Over the last 2 days it has disappeared 3 times (at least).The user has ran the symantec corp antivirus (at least a couple of times). All risks found have been quarentined and deleted, ran again and nothing found. Also ran Malwarebytes, which was clean. And ran ComboFix.At this point the hosts file has been fixed after running ComboFix.
View 14 Replies
View Related
Dec 4, 2012
I am trying to block access to facebook and twitter on my router, to a certain range of ips, 192.168.1.8 - 254. I have been digging around and trying stuff but all I do seems to restrict everyone access to the internet.
View 5 Replies
View Related
Mar 22, 2013
Why it makes problems to use a default route on a BGP-router (cisco 6500 with sup720 3bxl).Only a very few amount of hosts have that kind of problem and the 50% paket loss is only between this hosts. So another host has no loss to any of the affected hosts. looks for me like there is a problem in the CEF-table.The router has a BGP-fulltable. The gateway of last resort is only set for cases like a flapping BGP-route, so that the traffic is sent to a default next hop, because sometimes he knows a better route which isnt flapping.
View 1 Replies
View Related
Jun 8, 2013
I am struggling to get successfull pings beween asa and inside hosts but couldn't succeed. Done packet tracer result is acl-drop
Here is the running config
Prem-ASA(config)# sh run
: Saved
:
[Code].....
View 7 Replies
View Related
Jun 24, 2012
configuring ASA 5505 to be able to ping remote host.Setup - We have a site-to-site (192.168.1.0/24 - 192.168.2.0/24) VPN setup with client VPN access (IP Pool, 172.16.50.0/24) on 192.168.1.0 ASA 5505.Issue - Not able to ping host on 192.168.2.0 from VPN client 172.16.50.0 but able to ping 192.168.1.0 host.
View 8 Replies
View Related
Apr 7, 2013
I have a site to site vpn connection between ASA 5510 and PIX 515 which is working fine. There is no problem for hosts on any side of the tunnel to access a cross. However the local ip (192.168.20.1) on the client interface of my PIX is not allowed to access hosts on the other side of the tunnel. [code]
View 2 Replies
View Related
Sep 24, 2012
I'm testing upgrading an ASA from 8.2.5 to 8.4.4. During the the upgrade, it change all of my ACL host entries to objects. But I noticed that the keyword "host" is still a valid option when creating an ACL.
I'm trying to understand why this change is made during the migration.
View 3 Replies
View Related
Oct 3, 2011
Looks like I still have an issue with LMS to recognize the IP Phones in UT as IP Phones. SNMP RO on Call Manager is enabled and is green in CM (e.g. topology) - so SNMP get is basically fine. The Phones are recognised as End Devices in UT.
As far as I understand, now if I start a Phone Aquisition, the CUCM is polled by LMS to gather additional information about the phones. So it seems there is a problem with the SNMP polling of the Call manager?
View 5 Replies
View Related
Jun 9, 2011
DNS resolution works and I can surf the web without fail. But if I try to ping any external hosts (I can ping inside interface of ASA fine) from the LAN I get timeouts. I can ping anything from the ASA without fail.
ASA Version 8.4(1)
!
hostname fw1-nat-ann
domain-name inmd.infoblox.com
enable password anWLNen9CTFp7B/X encrypted
passwd 2KFQnbNIdI.2KYOU encrypted
names
View 1 Replies
View Related
Dec 6, 2012
I'm having an issue where internal hosts cannot access the internet but I am able to ping external hosts when I console into the router. The router is a 2800 series. [code]
View 3 Replies
View Related
Jun 18, 2012
I am able to reach VPN clients (Anyconnect) only from hosts directly connected to the ASA's inside interface subnet. However, hosts on other internal subnets (177.1.10.0 & 177.1.11.0) are unable to connect to clients on VPN. The ASA is running ver 8.4. [code]
View 8 Replies
View Related
Nov 21, 2012
ASA is running 8.4.
Internal interface: 172.16.1.1
External interface: 172.16.2.1
Routing to 192.168.0.0 via internal host.I've got some static NATs, e.g:
object network obj-192.168.0.1
nat (inside,outside) static obj-172.16.2.1
object network obj-192.168.0.3
nat (inside,outside) static obj-172.16.2.2
I also want in internal NAT, but only for certain external hosts, so when they connect to any of the above, their source address is changed. I've attempted the following so an external host (172.16.2.254), has it's source changed to 172.16.1.100.
nat (outside,inside) source static obj-172.16.2.254 obj-172.16.1.100
But it's source remains unchanged.What am I missing?
View 3 Replies
View Related
Aug 30, 2011
I have two hosts behind an ASA on a private network. Both hosts are NAT'ed (each has a unique public IP). I need Host A to be able to talk to Host B through their respective external IP's.
View 5 Replies
View Related
Sep 27, 2011
I am able to connect to my Cisco ISR 891 via VPN with the Cisco VPN Client 5.0.07.0440, but once connected I cannot access hosts on the inside. If I ping a host on the inside by name, nothing resolves. If I ping by IP, I get a reply from the public IP of the router. [code]
View 2 Replies
View Related
