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3640 , ip accounting turned on. Fully switched network.

Question.

I have a fully switched network at a remote site . They are complaining of poor response time and even timing out the AS/400 connection.

Recently they have introduced a backbone puredata switch which my 3640 router is plugged into.

The router is showing lots of collisions and deffered packets.

The pure data switch is showing fcs and alignment errors.

I used the web browser to connect to it but couldn't. I telneted and we noticed that the default gateway for the switch was a pix f/all on site.

I talked with people here and they had me turn off the ICMP redirects on the ethernet port of the router.

I then was able to make the switch believe his default gateway was my router and now I am able to use a web browser to look at the stats.

Due to the response time complaints I have also turned on IP accounting on the ethernet port on the 3620 router.

When I do a show ip accounting . I see destinations to the internet from a source internal ip. Which I would expect , however they are high and a lan person is telling me I should not see this. That once the session from the PC to the internet is established the pc then talks to the f/wall and not my routers ethernet port therefore I should see very small bytes for internet traffic is this true.

I think that since there is no vlans set up. all traffic is directed to my router since that is the PC's default route and my router directs it to the f/all.

Someone else suggested that it is because I turned off the ICMP redirects.

Can someone shed some light on this for me.

tks

Ann Marie Harper

5 REPLIES
Silver

Re: 3640 , ip accounting turned on. Fully switched network.

Ann Marie

FCS and aliginment errors are usually a duplex mismatch . Is one of the boxes using auto negotiation ? did you check the duplex settings ?

Community Member

Re: 3640 , ip accounting turned on. Fully switched network.

It was set to auto neg , I have advised them it should be hard coded.

Does anyone know the answer to my IP acctounting question.

The lan group is saying that since I am in a totally switched network my router should not see the traffic is this true.

Silver

Re: 3640 , ip accounting turned on. Fully switched network.

anne marie

When you hard code it you must reset the ports and or interface you are changing ,

As for the ip accounting , Since the Pix needs to send the traffic through the router to reach the internet you will see this traffic in IP accounting

Community Member

Re: 3640 , ip accounting turned on. Fully switched network.

So let me see if I am understanding this correctly.

If I have a server on the local segment and a pc on the local segment then if the pc talks to the server to get files or whatever he will bypass the router.

But if the PC wants to browse , download etc to the internet he talks to the firewall directly after the orginal path is establish, but the f/wall always send to the router back.

Why is this??

Then this has nothing to do with a switched or a non switched network.

or with me turning off the ICMP redirects.

I think you should just give me your phone # so I can pick your brain.

Silver

Re: 3640 , ip accounting turned on. Fully switched network.

send ma an e-mail deilert@att.com

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