I am attempting to configure a BGP router within a solaris zone, using dedicated network interfaces. Upstream provider insists on the use of MD5 authentication.

I have no bgp sessions coming up. I believe I have tracked down the problem to the following

when I restart quagga I get in the log

2017/08/28 16:36:34 BGP: can't set TCP_MD5SIG option on socket 7: Operation not applicable
2017/08/28 16:36:34 BGP: can't set TCP_MD5SIG option on socket 7: Operation not applicable

and tcpdump is showing that outgoing bgp packets have checksum failures incoming bgp packets have checksum passes

can someone tell me how to fix this

Answer

Warm tip !!!

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