There are a few ways on linux to see if the network stack is dropping packets, or just having problems in general:
1. ifconfig
... RX packets:522 errors:0 dropped:0 overruns:0 frame:0 TX packets:406 errors:0 dropped:0 overruns:0 frame:0 ...
2. cat /proc/net/dev
Inter-| Receive ... face | bytes packets errs drop fifo frame ... eth0: 87689 785 0 0 0 0 ... ...
3. cat /proc/net/udp
so local_address rem_address ... drops 277: 00000000:0044 00000000:0000 ... 0 ...
4. cat /proc/net/snmp
... Tcp: ... Udp: InDatagrams NoPorts InErrors OutDatagrams RcvbufErrors SndbufErrors Udp: 453 0 0 452 0 0 ...
You can also see this on a per-process basis using cat /proc/<pid>/net/{udp,dev,snmp}
Check out iftop also.
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