I use Ubntu 12.04 Server as a gateway/router. The server has two NetXtreme BCM5721 Gigabit Ethernet PCI Express cards for LAN and WAN interfaces. Opennms monitoring software shows incoming packet discards on the WAN (ISP) interface. The ISP provides direct Ethernet connectivity via SDH/SONET ring. However I don't see any packet discard on the LAN interface. Here is the WAN interface graph:
Are there any tools/commands to discover what is responsible for such packet discards. Is it possible to know if some misconfiguration at ISP's side is causing such an issue.
eth1 Link encap:Ethernet HWaddr **:**:**:**:63:5d inet addr:***.***.4.130 Bcast:***.***.4.131 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:865089489 errors:0 dropped:596 overruns:0 frame:3 TX packets:498072410 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:1092458492329 (1.0 TB) TX bytes:48179244881 (48.1 GB) Interrupt:17