Messages in this thread | | | Date | Sun, 31 Jan 1999 04:32:46 +0200 | From | Meelis Roos <> | Subject | Re: A router bug? |
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AC> If the MTU of the two links is different you should look for outgoing AC> frames through the router with no reply when the size of reply would be AC> large. Thats a clear indication that the remote site has firewalls set up AC> by overpaid underbrained morons from one of the many rich and clueless AC> consulting firms who think blocking all icmp on a firewall is a valid AC> thing to do.
If by any chance he is running IP masq on that router, things may become different. My experience shows that linux won't send back the ICMP error message in this case (eth. MTU 1550, slip MTU smaller, big packet wants to go through masq box but it never gets through and no ICMP message is generated). But it should since it's the point where the MTU gets smaller.
I tested it in 2.0.33 days, maybe things have changed. But somebody just wrote about this in linux-kernel about a week ago ("possible bug in ip masquerade" or something similar).
-- Meelis Roos (mroos@tartu.cyber.ee)
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