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New Member

cisco 1801 routing problems?

Hi there. First than all, I'm a newbie on cisco. Here's my problem. I have a cisco 1801 with FastEthernet0 connected to a wireless bridge (WAN) and FastEthernet 6 connected to a layer 2 switch (LAN). Router's WAN IP address is 192.168.100.44 and LAN IP is 192.168.135.1.

192.168.135.36 is a PC attached to the LAN.

from a computer somewhere else in the WAN to 192.168.135.36 does not succeed. Hops showed are

172.16.4.1 (remote LAN router)

* * * ---> never reaches 192.168.100.44? or it does not return icmp errors?

* * *

...

192.168.135.29 is a network printer on the LAN. traceroute from the WAN to it succeeds.

Hops showed are

172.16.4.1

192.168.100.44

192.168.135.29

Now, if i start pinging from 192.168.135.36 to

172.16.4.1, THEN pings and traceroutes start working from WAN to 192.168.135.36. After a while, it stops working again.

Any ideas? Thanks in advance.

2 REPLIES
New Member

Re: cisco 1801 routing problems?

If I read this right, Pings from the wan to the printer work? but pings to and from the lan PC do not unless you first ping or traceroute to the printer from the wan?

A show run posted here may help.

Check the simple things first. Access lists on the 1801 are there any or not if so what happens when you remove them. Are you doing Nat or not, Is there an IP addressing conflict on the lan.

Puzzeled

Gene

New Member

Re: cisco 1801 routing problems?

Hi: i think my previous post was not clear. Pings and traceroutes from the wan to a computer on the lan do not work. To the printer on the lan, do work. Then, if i ping from the lan computer to the core router of the wan, previous pings and traceroutes start working. There are no ACLs, no NAT and no IP conflicts (we are using dhcp). It's like the 1801 wanted the PC to send traffic to the wan before allowing any wan traffic to reach it. Thanks in advance.

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