NFS & tcpdump error in CentOS

[nishithvyas]

Hello,

I have configured NFS Server on CentOS 5.2 with an IBM Web Server(AIX).

The IBM Web Server can upload all data onto NFS Server. Now, today i was having slow response on IBM Web Server & by measuring the NFS, i found below error while running "tcpdump" command.

I have ran "tcpdump" command on NFS Server.

tcpdump -n -i eth1 | grep 2049

18:36:37.237451 IP 10.100.19.241.2049 > 10.100.19.88.1758143293: reply ok 1448 read [|nfs]
18:36:37.237476 IP 10.100.19.241.2049 > 10.100.19.88.539981409: reply ERR 1448

18:36:37.237481 IP 10.100.19.241.2049 > 10.100.19.88.796287348: reply ERR 1448
18:36:37.237488 IP 10.100.19.241.2049 > 10.100.19.88.1986098295: reply ERR 1448
18:36:37.237566 IP 10.100.19.241.2049 > 10.100.19.88.539762736: reply ERR 1448

18:36:37.237595 IP 10.100.19.241.2049 > 10.100.19.88.740307248: reply ERR 1448
18:36:37.237599 IP 10.100.19.241.2049 > 10.100.19.88.808333616: reply ERR 208
18:36:37.237792 IP 10.100.19.241.2049 > 10.100.19.88.1758143294: reply ok 1448 read [|nfs]

18:36:37.237810 IP 10.100.19.241.2049 > 10.100.19.88.1700950889: reply ERR 1448
18:36:37.237827 IP 10.100.19.241.2049 > 10.100.19.88.539762735: reply ERR 1332
18:36:37.237866 IP 10.100.19.241.2049 > 10.100.19.88.825830968: reply ERR 1448

18:36:37.237947 IP 10.100.19.241.2049 > 10.100.19.88.808333625: reply ERR 1200
18:36:37.237967 IP 10.100.19.241.2049 > 10.100.19.88.775435808: reply ERR 1448
18:36:37.237973 IP 10.100.19.241.2049 > 10.100.19.88.959330358: reply ERR 1448

18:36:37.237980 IP 10.100.19.241.2049 > 10.100.19.88.908078112: reply ERR 1448
18:36:37.237987 IP 10.100.19.241.2049 > 10.100.19.88.540030496: reply ERR 1448
18:36:37.238041 IP 10.100.19.241.2049 > 10.100.19.88.825897271: reply ERR 1448

18:36:37.238048 IP 10.100.19.241.2049 > 10.100.19.88.540094778: reply ERR 1448
18:36:37.238055 IP 10.100.19.241.2049 > 10.100.19.88.825237553: reply ERR 1448
18:36:37.238109 IP 10.100.19.241.2049 > 10.100.19.88.808529952: reply ERR 1448

18:36:37.238120 IP 10.100.19.88.1758143297 > 10.100.19.241.2049: 116 read [|nfs]
18:36:37.238129 IP 10.100.19.241.2049 > 10.100.19.88.842019120: reply ERR 704
18:36:37.238142 IP 10.100.19.241.2049 > 10.100.19.88.740306806: reply ERR 1448

18:36:37.238158 IP 10.100.19.241.2049 > 10.100.19.88.892805164: reply ERR 1200
18:36:37.238175 IP 10.100.19.241.2049 > 10.100.19.88.1758143288: reply ok 148 setattr [|nfs]
18:36:37.238256 IP 10.100.19.241.2049 > 10.100.19.88.1758143296: reply ok 1448

18:36:37.238263 IP 10.100.19.241.2049 > 10.100.19.88.1869440302: reply ERR 1448
16133 packets captured
23339 packets received by filter
7100 packets dropped by kernel

10.100.18.241 is the IP of NFS Server & 10.100.19.88 IP belongs to IBM Web Server.


Kindly Help




--
Regards,
Nishith N. Vyas

[Rubberman]

There can be any number of reasons why you are getting packet errors like this. The most likely reasons are:

1. One of the computers' network cards is bad.
2. A cable is bad.
3. One or more of the ports on a switch/router are bad.
4. A switch or router is failing.
5. Gremlins have taken up housekeeping in your network.