OpenVPN
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Quality problems
Let's check:
netstat -su IcmpMsg: InType0: 122 InType3: 87766934 InType4: 1 InType8: 588647 InType11: 34425 OutType0: 588647 OutType3: 361015 OutType8: 147 OutType11: 4 OutType69: 81 Udp: 6466380347 packets received 1734023 packets to unknown port received. 114290 packet receive errors 7286849797 packets sent RcvbufErrors: 755 UdpLite: IpExt: InNoRoutes: 235 InBcastPkts: 6939 InOctets: 645972134459 OutOctets: 761963749406 InBcastOctets: 2398693
Here are the problems:
1734023 packets to unknown port received. 114290 packet receive errors RcvbufErrors: 755
Let's check receive socket size:
sysctl -a | grep rmem net.core.rmem_default = 212992 net.core.rmem_max = 212992
200 kb is too low.
Lets increase it to default 1mb, max 4mb:
sysctl -w net.core.rmem_default=1048576 sysctl -w net.core.rmem_max=4194304
In order to survive reboot, put this into /etc/sysctl.conf
... net.core.rmem_default = 1048576 net.core.rmem_max = 4194304
