I just got 50 Mbps symmetric fiber from AT&T and it includes a /56 of IPv6
addresses, replacing a much slower ADSL line. I never tried to get IPv6
working on the old connection. I'm using CentOS 7 as a gateway and it's
worked great for several versions for IPv4.
I'm not seeing any IPv6 default route on the WAN interface. I suspect I'm
not getting route announcements. I think I have all the IPv6 variables in
ifcfg-em2 set right. But I do notice that the accept_ra file in proc for
that interface has value 1, not 2. Changing it to 2 doesn't change
anything, though. No route appears.
While I wait for an answer to my trouble ticket, is there some way to
verify that I'm not receiving any RA packets? Is there a way to force a
solicitation for one? Is there a tcpdump invocation I can use to watch for
them? Are there log messages that will tell me when an RA has been seen and
added to the routing table or ignored?
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