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Webcast-Catalyst9k
New Member

Default Route

Network Topology:

LAN---E0/0 Cisco2610 S0/0---ISP

The IP address of 2610:

E0/0: 211.55.83.241/28

S0/0: 211.55.83.211/32

The IP address of ISP gateway: 172.16.138.17

Problem:

when I config the S0/0 using 32 bit mask, the router reject me with comment "bad mask /32 for address 211.55.83.224".

Question:

1. How can I set the IP of S0/0 to have a 32 bit mask?

2. How can I set the router to route all traffic to the ISP gateway address?

Any comment will be appreciated.

3 REPLIES
Silver

Re: Default Route

Are you using any IP's that fall in the 211.55.83.224/29 range on any other interface on the box . 211.55.83.224 is a network address the box may not like this address if you are using any other address in the 211.55.83.224/29 range .

to use your default gateway you can use the 'ip default gateway x.x.x.x' command or a default router 'ip route 0.0.0.0 0.0.0.0 172.16.138.17, If s0 connects to your ISP I think you are going to have to assign the ip address 172.16.138.18/30 , this is the ip address your ISP should have given you , If you configure 211.55.83.211, you will have a pipe that have ip addresses that are not on the same subnet , this will not work.

Bronze

Re: Default Route

Seems like a 32 bit mask on a physical port (not a loopback)is pointless and possibly illegal. It cannot talk to anything if its the only port in the network.

New Member

Re: Default Route

Thanks for your comments. I will consult my ISP and find the reason.

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