[LARTC] Random ping jumps

[Artūras Šlajus]

Hello,

   I've got this problem. There is an linux server with 2.4.24 kernel
and pinging from him to internet (or from lan) ping randomly jumps up:

64 bytes from fortas.ktu.lt (193.219.160.131): icmp_seq=387 ttl=59 time=30.0 ms
64 bytes from fortas.ktu.lt (193.219.160.131): icmp_seq=388 ttl=59 time=32.6 ms
64 bytes from fortas.ktu.lt (193.219.160.131): icmp_seq=389 ttl=59 time=34.9 ms
64 bytes from fortas.ktu.lt (193.219.160.131): icmp_seq=390 ttl=59 time=198 ms
64 bytes from fortas.ktu.lt (193.219.160.131): icmp_seq=391 ttl=59 time=407 ms
64 bytes from fortas.ktu.lt (193.219.160.131): icmp_seq=392 ttl=59 time=407 ms
64 bytes from fortas.ktu.lt (193.219.160.131): icmp_seq=393 ttl=59 time=430 ms
64 bytes from fortas.ktu.lt (193.219.160.131): icmp_seq=394 ttl=59 time=30.9 ms
64 bytes from fortas.ktu.lt (193.219.160.131): icmp_seq=395 ttl=59 time=31.6 ms

   Internet line isn't loaded up, server load fine. QOS isn't used, qdiscs default.
I don't realize what the problem is and even how to debug it. Sysctl config:
net/ipv4/ip_forward = 1
net/ipv4/icmp_ignore_bogus_error_responses = 1
net/ipv4/icmp_echo_ignore_broadcasts = 1
net/ipv4/tcp_syncookies = 1
net/ipv4/tcp_timestamps = 0
net/ipv4/tcp_window_scaling = 0
net/ipv4/tcp_sack = 0
net/ipv4/tcp_fin_timeout = 30
net/ipv4/tcp_keepalive_time = 1800
net/ipv4/tcp_low_latency = 1

Thanks for any thoughts.