Re:IP static route summary query

[ambivert skill]

Hi,

In my Lab environment in GNS I have connected two 7200 series router through fastethernet on router A I have given IP adress 192.168.10.54 and router B I have given IP address 192.168.10.53 and default route as 0.0.0.0 0.0.0.0 192.168.10.53 and when I run the command on router A it shows result as follows  "C  192.168.10.52/24 is directly connected ,Fast ethernet 2/0".

So I need to know why it's showing the result of .52 at last why not .53 or .54 at last what is the reason it's showing .52 which I have not mentioned in my IP address.

Thanks

[InayathUlla Sharieff]

Hi Ambivert,

Can you paste the configuration?

I just tested this and it showing me the correct value:

R1---F1/0----------------F1/0 R2

R1

R1#sh run int f1/0

Building configuration...

Current configuration : 98 bytes

!

interface FastEthernet1/0

ip address 192.168.10.54 255.255.255.0

duplex auto

speed auto

end

R1#sh ip route

Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP

Gateway of last resort is not set

C    192.168.10.0/24 is directly connected, FastEthernet1/0 <<<<<

#########R2 Config###########

R2#sh run int f1/0

Building configuration...

Current configuration : 98 bytes

!

interface FastEthernet1/0

ip address 192.168.10.53 255.255.255.0

duplex auto

speed auto

end

ip route 0.0.0.0 0.0.0.0 192.168.10.54

R2#sh ip route

Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP

     Gateway of last resort is 192.168.10.54 to network 0.0.0.0

C    192.168.10.0/24 is directly connected, FastEthernet1/0 <<<<<<<

S*   0.0.0.0/0 [1/0] via 192.168.10.54

Questions:

======

1- I believe you are not using the default subnet mask on the interface? If i use /30 then I would be seeing the exact route:

R1(config)#int f1/0

R1(config-if)#ip address 192.168.10.54 255.255.255.252

R1#show ip route

     192.168.10.0/30 is subnetted, 1 subnets

C       192.168.10.52 is directly connected, FastEthernet1/0 <<<< 52 is displayed.

2- Kinldy provide us the config and we will tell you the reason you are seeing.

HTH

Regards

Inayath

*Plz rate the usefull posts.

[ambivert skill]

Thanks Inayath I have use this not on default subnet but on subnet of /30 for you reference I am sending you my test

configuration we have like this R1 Fa0/1(10.225.222.54) ------R2 Fa0/1(10.225.222.53) but in #show ip route command it shows "C  10.225.222.52/30 is directly connected ,Fast ethernet 0/1".

So this thing is not clear why it's showing 10.225.222.52  .52 at last please let me know the reason behind it.

Regards

Ambivert

[cadet alain]

Hi,

it is showing the subnet  and the subnet is .52 , if you had .53 then it would be the host id and it would be a L route on newer 15.x IOS.

Regards

Alain

Don't forget to rate helpful posts.

[InayathUlla Sharieff · Accepted solution]

HI Ambivert,

Then thats the correct thing you are seeing. I have showed this to you on my previous update:

If you are using the /30 then the subnet would be displayed. 

R1(config)#int f1/0

R1(config-if)#ip address 192.168.10.54 255.255.255.252

R1#show ip route

     192.168.10.0/30 is subnetted, 1 subnets

C       192.168.10.52 is directly connected, FastEthernet1/0 <<<< 52 is displayed.

In your scenario:

===========

10.255.222.52 is the subnet and followed by the host ids.  ( 10.255.222.53 & 10.255.222.54 will be the two host which can be on .52 subnet hence it only shows you the .52 in the routing table.

Details on your subnet below:

http://www.subnet-calculator.com/subnet.php?net_class=A

http://www.subnetonline.com/pages/subnet-calculators/ip-subnet-calculator.php

HTH

Regards

Inayath

*Plz rate the helpfull posts.

[ambivert skill]

Thanks both of you for explaining me the reason behind it.

Regards

Ambivert