Slow access speeds for backup server

Hi all,

I run a small network with a primary and secondary debian server which access the net through a debian router. The debian router serves 3 separate intranets and like the servers, is running Sarge stable.

Over the past couple of weeks I've noticed that access times to the backup server have been steadily increasing and now it takes about 2 minutes to display a web page. At first I thought it might be a router issue because when I ran tcpdump the summary at the end said:

403 packets captured
6682 packets received by filter
6279 packets dropped by kernel

Although I'm not an experienced Linux user, this seemed to be quite a lot of dropped packets however when I ran tcpdump again there were hardly any dropped packets...(?).

Access times to the main server seem relatively unaffected so I assume if the problem was due to external causes like denial of service attacks it would affect everything.

Could this lag problem be something to do with process load on the backup server? If so is there a way to check what is causing the load? Or if this is a network issue is there a way to determine the cause?

This network configuration has been running fine for over a year now without any changes so I'm a bit stumped about what the problem is.

Regards,

-Duncan


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