[ipxe-devel] DNS resolution runs into timeout

Sven Dreyer sven at dreyer-net.de
Fri Dec 6 14:09:41 UTC 2013

Am 06.12.2013 14:32, schrieb Michael Brown:
> - RA and DHCPv6 seem to be advertising different DNS servers (check
> "show net0.ndp/dns6" and "show net0.dhcpv6/dns6")

You are right. But both of these nameservers are answering to queries, 
so I didn't see a problem with that.

> - neither RA nor DHCPv6 is providing a global IPv6 address for iPXE

With "global", do you mean a 2000::/3 address? Both radvd and 
wide-dhcpv6s provide addresses from the 2002:4db7:c08::/64 (my 6to4 
subnet) scope. That works with all IPv6 capable devices in my network up 
to now.

> The upshot is that your RA/DHCPv6 configuration is providing iPXE with
> an IPv6 address for the DNS server, but is not providing iPXE with a
> usable IPv6 address from which to reach the DNS server.

Does that mean that iPXE ignores the addresses from the 
2002:4db7:c08::/64 range that radvd and wide-dhcpv6s offer because they 
are not in the "global" (2000::/3) range?

> If this isn't enough information to resolve the problem, then could you
> build with DEBUG=ndp,dhcpv6 and provide the output from "ifconf -c ipv6"?

I am a bit confused now. I attached two screenshots, "debug.png" with 
debug information and "ifconf.png" with the results of the ifconf command.


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