Occasional warnings in ipv6 logs



  • I have noticed occasionally in the wan_dhcp6 renewal process I am seeing logged kernel errors (warnings) reporting it cannot foward src.

    examples below

    Jan 13 22:39:15	kernel		cannot forward src fe80:4::c6e9:84ff:x:x, dst x0:1450:4009:80e::200e, nxt 6, rcvif igb1, outif igb0
    Jan 13 22:41:25	kernel		cannot forward src fe80:4::c6e9:84ff:x:x, dst x0:1450:4009:80e::200e, nxt 6, rcvif igb1, outif igb0
    Jan 13 22:42:18	kernel		cannot forward src fe80:4::c6e9:84ff:x:x, dst x1:578:3::34d1:3bdc, nxt 6, rcvif igb1, outif igb0
    Jan 13 22:43:36	kernel		cannot forward src fe80:4::c6e9:84ff:x:x, dst x0:1450:4009:80d::200a, nxt 6, rcvif igb1, outif igb0
    

    I censored some octets, the dst octets are very close to my actual wan ip prefix but not quite in the same range.

    From what I can observe there is no actual ipv6 outages as the connection is monitored and I have idle ssh sessions which are remaining connected, so just curious on thoughts on what I am seeing.  If there is a way to silence it and if it represents a real problem.


  • Rebel Alliance Developer Netgate

    Something tried to send traffic sourced from a link-local address to a destination off the local network, which is illegal so it dropped the packet. Find whatever is bound to that fe80 address.


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