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New Member

Connectivity Dropping Randomly

I recently changed ISPs which involved setting up and implementing a new router to the outside. I installed a 3640 with 12.3(5).

Background Info:

I have 4 T1s bundled together with PPP Multilink to create a 6M connection. (Serial 1/0-2/1)

Interface Multilink1 has an external IP with a /30 address that connects to the edge of the ISP.

Ethernet1/0 acts at my ethernet default GW with a /27 network address and is plugged into a VLAN on my 6509 that acts as "DMZ"

The only other device plugged into that VLAN is a Linux firewall with two NICs (one plugged into the ISP Vlan and the other on the LAN. The firewall performs all the NAT translations, etc

Problem:

Since changing ISPs, clients on the LAN that run either MSN Messenger or Yahoo Messenger get logged out of their respective messenging client randomly. I have removed all access-lists on the 3640 router in an attempt to resolve the problem and it still continues.

2 REPLIES
Bronze

Re: Connectivity Dropping Randomly

I think some more analysis is required on the router, like flapping links and routes, debugging MLPPP etc.. If they are stable, analyzing the respective sessions with the relevant show/debugs commands might give a clue.

New Member

Re: Connectivity Dropping Randomly

Thanks for the ideas. I actually did some more troubleshooting on the router and found that the router itself was set to debug all. After doing a 'no debug all' the issue stopped occuring.

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