ftp extremely slow after n/w change, slows machine down

[Banibrata Dutta]

Hi,

We moved few servers to a new location, and I am having a peculiar problem with one particular machine. This machine is a rp3400 machine (2 dual-core CPU + 2 GB ram, Gigabit ethernet on board). The machine has been put on a switched network, and new IP-address assigned. Also there was a change in domain name involved (tertiatary-level name change, i.e. host.abc.xyz.com to host.def.xyz.com).

Post these changes, I am able to telnet into this machine with both the IP and hostname, just fine. Result of "top" looks pretty decent (i.e. CPU utilization very normal). The moment i FTP into this machine to upload or download, problems start. When I try to ftp in/out a file, the transfer rate shown is about 5-10kbps. It takes ages to ftp a 100KB file, and the CPU utilization goes up drastically.

Surprisingly when I do "netstat -r", I see the both the old GW (which should no longer be used), and the new GW (which is what should be used). IMHO the necessary changes hv been made in the appropriate config files.

Any pointers on what to check, if any diagnostics can be performed or what to do next to fix this issue ?

thanks,
bd

[RAC_1 · Accepted solution]

Check network speed on both ends. On system and on switch/router side. They should match.

If you have speed and duplex settings mismatch, you may run into a problem.

lanadmin -g "nm_id_of_nic" , check fcs and late collision errors.

[Henk Geurts]

did you alter the /etc/rc.config.d/netconf file after the last reboot? then you should still remove the old gateway with
"route delete" command or reboot..

regards.

[Banibrata Dutta]

We changed the switch, and turned-off autonegotiation on the port. Post these changes, the FTP speed is back to normal, and so is machine performance during FTP.
Thanks for the replies.