Dear list members I ran into a problem with IPv6 neighbor discovery.
It's a openbsd (4.5-stable) box acting as router attached to a IXP switch. The ipv6 nd works with all peers but one (cisco), while the nonworking peer works from our second box (4.5-stable too)... when I add a static entry using ndp -s everything works just fine... But I would really like to know what causes this... Does someone around here has an idea what to look for? I don't really know how to debug this... I thought it might be a problem with blocking icmpv6, but why would the other session work then? I'll try to do some tcpdump later in the evening when traffic not that high (I saw some examples at http://tldp.org/HOWTO/Linux+IPv6-HOWTO/examples-tcpdump.html) Regards Andri
