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Re: How to resolve packet loss & tranmission errors on a linux server. Please suggest.



The fault could be either with your cable, hub/switch. Rarely it might be an autonegotiation issue between your host and the switch... 1)Check and if possibly replace your host's cable with a known good working one. 2)If the problem persists, try to change the port on the hub switch. If you connect to a managed switch, it could probably give you more useful stats. 3)Sometimes, autonegotiation (speed and duplex settings) between your server and a switch is to blame. Check that both your host's card and the switch are on the same duplex and speed settings. If your switch supports the option of autonegotiation, turn it off and set the switch port explicitly to what your server ethernet card supports by default (eg, 100 Mbps FD , etc...).

If neither 1) 2) 3) solve the problem, something is happenning with your server interface. In that case, dmesg and cat /proc/net/dev might give us slightly more info than the netstat -i .

GM

unix syzadmin wrote:
Hi,

In one of our Linux servers (RHEL-AS2.1 Update 5), the ping response was
very slow.  From the following, it looks like there is a packet loss&
transmission errors (80% packet loss, TX-ERR=39962)  .  Please suggest how
to resolve this issue.

[root bangpcrh212 root]# ping bangapps
PING bangapps.bea.com (172.22.40.9) from 172.22.43.22 : 56(84) bytes of
data.
64 bytes from bangapps.bea.com (172.22.40.9): icmp_seq=0 ttl=62 time=170
usec
64 bytes from bangapps.bea.com (172.22.40.9): icmp_seq=1 ttl=62 time=298
usec
64 bytes from bangapps.bea.com (172.22.40.9): icmp_seq=2 ttl=62 time=213
usec
64 bytes from bangapps.bea.com (172.22.40.9): icmp_seq=3 ttl=62 time=254
usec

--- bangapps.bea.com ping statistics ---
25 packets transmitted, 5 packets received, 80% packet loss
round-trip min/avg/max/mdev = 0.168/0.220/0.298/0.052 ms
[root bangpcrh212 root]# netstat -i
Kernel Interface table
Iface       MTU Met    RX-OK RX-ERR RX-DRP RX-OVR    TX-OK TX-ERR TX-DRP
TX-OVR Flg
eth0       1500   0  3595100   0             0                  0  2813499
39962      0      0 BMRU
eth0:1     1500   0        0      0              0                  0
0      0             0      0 BMRU
eth0:2     1500   0        0      0              0                  0
0      0             0      0 BMRU
eth0:3     1500   0        0      0              0                  0
0      0             0      0 BMRU
eth0:4     1500   0        0      0             0                   0
0      0             0      0 BMRU
lo        16436   0   252789   0              0                   0
252789   0            0      0 LRU

Thanks & Regards

-GnanaShekar-

--
--
George B. Magklaras

Senior Computer Systems Engineer/UNIX Systems Administrator
The Biotechnology Centre of Oslo,
University of Oslo
http://www.biotek.uio.no/

EMBnet Norway: http://www.biotek.uio.no/EMBNET/



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