Hi,
I have an E3-1240 fedora37 postfix system using SSDs connected to a cable
modem that's having problems with dropped packets. There is one other
fedora37 server (E5-1650) directly connected to the cable modem that is not
having the same problem, although it's just routing packets, not really
doing much processing of data. The server with the problem is using
libreswan to create a VPN between itself and an i7-7700K with fedora37
managed at OVH, thinking it would be more resilient than the cable
connection itself. The problem also happens without the VPN, but perhaps
not to the same degree.
I think the server is certainly powerful enough to process the amount of
DNS queries, but there's also a lot of timeouts.
How do I troubleshoot this? It's the bridge experiencing the dropped
packets, not the interface itself, it seems?
They're not packet errors - just dropped packets. Perhaps the processor
can't handle the traffic?
Do you have a server connected to a cable modem? Is there something about
it being a cable connection that could be causing this?
There's about 27k dropped packets in about 12 hours of uptime.
br0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 68.195.111.45 netmask 255.255.255.248 broadcast 68.195.111.47
ether ae:64:2c:25:b5:44 txqueuelen 1000 (Ethernet)
RX packets 11355786 bytes 21634260431 (20.1 GiB)
RX errors 0 dropped 26349 overruns 0 frame 0
TX packets 7374430 bytes 993860294 (947.8 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
ether 14:da:e9:97:ab:72 txqueuelen 1000 (Ethernet)
RX packets 16224042 bytes 22179550934 (20.6 GiB)
RX errors 0 dropped 165 overruns 0 frame 0
TX packets 7493927 bytes 1031987928 (984.1 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device interrupt 17 memory 0xdf100000-df120000
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