Date: Thu, 18 Dec 2008 21:58:59 +0100 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-net@freebsd.org Subject: IPv6 routing help? Message-ID: <giedif$bd0$1@ger.gmane.org>
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[-- Attachment #1 --] Hi, I'm experimenting with IPv6 and have 6to4 running on a machine (thanks to Hajimu UMEMOTO). I'm now trying to configure another system on a LAN, running Linux, to use the 6to4 one as a IPv6 router. I've configured ipv6 forwarding on the router, and started rtadvd. The client machine apparently sees the route and has autoconfigured the following: # ip -6 route show fe80::/64 dev eth0 metric 256 expires -205814sec mtu 1500 advmss 1440 hoplimit 4294967295 default via fe80::250:8bff:feeb:8401 dev eth0 proto kernel metric 1024 expires 1396sec mtu 1500 advmss 1440 hoplimit 64 The last line correctly lists the link-local ipv6 address of the router. This looks ok, except attempts to actually use ping6 on this address fail: # ping6 fe80::250:8bff:feeb:8401 connect: Invalid argument But, pinging the router's external IPv6 address works from the client: # ping6 2002:xxyy:xxyy::1 PING 2002:xxyy:xxyy::1(2002:xxyy:xxyy::1) 56 data bytes 64 bytes from 2002:xxyy:xxyy::1: icmp_seq=1 ttl=64 time=0.492 ms 64 bytes from 2002:xxyy:xxyy::1: icmp_seq=2 ttl=64 time=0.501 ms --- 2002:xxyy:xxyy::1 ping statistics --- 2 packets transmitted, 2 received, 0% packet loss, time 999ms rtt min/avg/max/mdev = 0.492/0.496/0.501/0.022 ms But pinging any outside address fails: # ping6 www.freebsd.org PING www.freebsd.org(www.freebsd.org) 56 data bytes From fe80::250:8bff:feeb:8401 icmp_seq=1 Destination unreachable: Beyond scope of source address From fe80::250:8bff:feeb:8401 icmp_seq=2 Destination unreachable: Beyond scope of source address --- www.freebsd.org ping statistics --- 2 packets transmitted, 0 received, +2 errors, 100% packet loss, time 1000ms As far as I understand ipv6 (very little), this basically says the router told the client it can't send packets to outside addresses with source addresses that are link-local. Is this correct? However, adding an ipv6 address to the client, in this case 2002:xxyy:xxyy::10/64 doesn't help and breaks even pinging the router's external address. It looks to me like I'm missing something important in the relation between the link-local and the global addresses, but what? [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD4DBQFJSrmTldnAQVacBcgRAo/TAJdftGN9L99VxQbjAm3ctVlKl+60AJwIszMl j83pWien7JImZ2h3e6Sjnw== =ONqb -----END PGP SIGNATURE-----
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