Question

arp requests with no answer

Asked by: ag79

hi,

I'm setting up a windows 2000 server on a multi-network.
However, once the server is connected to the LAN it makes it crash after a while (network congestion).
Using an Ethernet Package Analyser I noticed that the Windows server keeps sending some ARP requests ("arp who-has machine.ip tell me.ip" requests) & never obtains any answer (I guess it should receive some "arp reply machine.ip is-at machine.mac" packages in response).
This Windows server does not run any DNS or DHCP servers (those are run by a Linux server). I also disabled the WINS server.

Does anyone have an idea about what's wrong with my config? Do I have to change something on the router?
Thanks for your help.

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Asked On
2003-05-26 at 08:21:23ID20626574
Tags

arp

,

answer

,

linux

,

requests

Topic

Miscellaneous Networking

Participating Experts
3
Points
125
Comments
5

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Answers

 

by: SMackPosted on 2003-05-26 at 23:12:12ID: 8587926

Probably the easiest thing would be to see what IP address the ARP is asking to resolve. If it's not on your LAN, it should at least point you to what process is looking.

If it's asking for something that looks like the right address or close, you have a typo. If it's asking for something that doesn't vaguely resemble an address on your LAN, then something is really wrong; your PC believes the address is local ... or it wouldn't be ARPing (or at the very least, it would be ARPing for the Default Gateway MAC).

My initial impression is that you have an improper mask somewhere ... the address will look right, but because the mask is incorrect (it would be too long ... like maybe it's "255.255.2YY.X" (X = 0-255, Y=00-55) instead of something like "255.255.248.0" or "255.255.128.0" ....

Check all your masks, check the requesting MAC and try to match it to a host.

Good Luck

Scott

 

by: SMackPosted on 2003-05-26 at 23:16:48ID: 8587959

(I wish this place had an Edit function)
I just noticed you mention a "multiLan environment" -
Do you mean that you are running several different address blocks over the same physical media?

If that's the case, then you need a router that can recognize the several address blocks and route the packets from block-to-block (inter-VLAN routing).

I don't know of any consumer-grade routers that can handle more than one address block per segment; you may have to upgrade to a commercial-grade router (even a Cisco 2500 can handle it, you only need one Ethernet port).

Scott

 

by: CleanupPingPosted on 2003-08-14 at 19:53:01ID: 9151815

ag79:
This old question needs to be finalized -- accept an answer, split points, or get a refund.  For information on your options, please click here-> http:/help/closing.jsp#1
EXPERTS:
Post your closing recommendations!  No comment means you don't care.

 

by: juliancrawfordPosted on 2004-01-17 at 14:01:28ID: 10137738

No comment has been added lately, so it's time to clean up this TA.
I will leave the following recommendation for this question in the Cleanup topic area:

Accept: SMack {http:#8587959}

Please leave any comments here within the next seven days.
PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!

Julian Crawford
EE Cleanup Volunteer

20120131-EE-VQP-002

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