[Openswan Users] cause of dropped packets in interface stats
patrickn at xelerance.com
Mon Jun 17 13:35:32 UTC 2013
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From: Roel van Meer <roel.vanmeer at bokxing-it.nl>
Subject: cause of dropped packets in interface stats
Date: 12 June, 2013 7:45:48 AM EDT
To: users at lists.openswan.org
We're running a linux server with OpenSwan 2.6.38, using KLIPS and with about 100 tunnels. All is working well.
However, the interface statistics of the ipsec0 interface look like this:
ipsec0 Link encap:Ethernet HWaddr aa:aa:aa:aa:aa:aa
inet addr:pu.bli.cip.adr Mask:255.255.255.255
UP RUNNING NOARP MTU:1500 Metric:1
RX packets:1536163134 errors:0 dropped:3594958 overruns:0 frame:0
TX packets:1453236498 errors:0 dropped:2455020 overruns:0 carrier:0
RX bytes:220749612688 (205.5 GiB) TX bytes:345964228696 (322.2 GiB)
The dropped packet counters are quite high, which is something I have no explanation for.
Could someone explain in which cases a packet would be dropped?
For transmitted packets, I know one situation, which is if there is a route via ipsec0 and there is currently no tunnel for it. But how about the recieved packets?
As a related question: could this be indicative of a server overload problem?
Thanks in advance,
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