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You have the symptoms of an MTU problem: some TCP connections freeze, more or less reproducibly for a given command or URL but with no easily discernible overall pattern. A telltale symptom is that interactive ssh sessions work well as long as you don't run commands with large output. See Can't access select https sites on Linux over PPPoE for an ...


2

Gilles' answer is completely correct, but there is also another potential cause for this. There was a bug in version 2.3.0 of OpenVPN which would disconnect clients when sending large chunks of data: https://community.openvpn.net/openvpn/ticket/263 This issue only occurred when using TCP. UDP was completely unaffected.


1

I don't have the full output pre-grep because my scrollbuffer filled up, but: # ip addr show dev eth0 |grep 192.168.[12] inet 192.168.1.1/16 scope global eth0 inet 192.168.1.2/16 scope global secondary eth0 inet 192.168.1.3/16 scope global secondary eth0 inet 192.168.1.4/16 scope global secondary eth0 inet 192.168.1.5/16 scope global secondary eth0 ... ...



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