Greg, thanks for u'r answer, i try that : first with 128 packet lengt : traceroute to 172.16.0.4 (172.16.0.4), 30 hops max, 128 byte packets 1 172.16.1.251 (172.16.1.251) 0.576 ms 0.491 ms 0.471 ms 2 172.16.0.4 (172.16.0.4) 0.592 ms 0.520 ms 0.514 ms
and with 256 packet lengt : traceroute to 172.16.0.4 (172.16.0.4), 30 hops max, 256 byte packets 1 172.16.1.251 (172.16.1.251) 0.840 ms 0.754 ms 0.729 ms 2 * * * 3 * * *
172.16.1.251 is the gateway (asl) for private2 (172.16.1)
Generally when you are able to pass small packets but not large packets it points to either a problem with your NIC's or your CAT 5 cabling.
I'd start with checking the cabling. Make sure all of your punch downs are accomplished properly and none of the wires are crossed. If you have access to test equipment like a penta scanner I'd scan the cables too. A good CAT 5 cabling job should be able to pass packets in excess of 30,000 bytes without any problem.
If everything proves correct with your cabling then the next suspect would be one of the NIC's.
Generally when you are able to pass small packets but not large packets it points to either a problem with your NIC's or your CAT 5 cabling.
I'd start with checking the cabling. Make sure all of your punch downs are accomplished properly and none of the wires are crossed. If you have access to test equipment like a penta scanner I'd scan the cables too. A good CAT 5 cabling job should be able to pass packets in excess of 30,000 bytes without any problem.
If everything proves correct with your cabling then the next suspect would be one of the NIC's.
I think u right, i suspect one of nic (the private2 one) because it's a old card, it's maybe that.... but, i try other traceroute and i have this result:
-1- with 56 packet lent traceroute to 172.16.0.4 (172.16.0.4), 30 hops max, 56 byte packets 1 172.16.1.251 (172.16.1.251) 0.492 ms 0.404 ms 0.397 ms 2 172.16.0.4 (172.16.0.4) 0.547 ms 0.463 ms 0.460 ms
-2- with 256 packet lent traceroute to 172.16.0.4 (172.16.0.4), 30 hops max, 256 byte packets 1 172.16.1.251 (172.16.1.251) 0.903 ms 0.790 ms 0.777 ms 2 * * * 3 * * *
-3- with 465 packet lent traceroute to 172.16.0.4 (172.16.0.4), 30 hops max, 456 byte packets 1 172.16.1.251 (172.16.1.251) 1.319 ms 1.224 ms 1.185 ms 2 172.16.0.4 (172.16.0.4) 1.016 ms 0.947 ms 0.943 ms
Strange isn't it ?? why it's ok with 465, but not with 256 ?