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    SubjectRe: 2.4.21+ - IPv6 over IPv4 tunneling b0rked


    Mika Liljeberg wrote:

    >Nope, since the tunnel interface will have 2002::/16. It seems to work
    >with the attached patch (against 2.4.21-ac4). A small fix to sit was
    >required as well. Look:
    >
    >
    ok, forgot that...looks ok to me.

    --Mika


    >hades:~# ifconfig 6to4
    >6to4 Link encap:IPv6-in-IPv4
    > inet6 addr: ::213.243.180.94/128 Scope:Compat
    > inet6 addr: 2002:d5f3:b45e::1/16 Scope:Global
    > UP RUNNING NOARP MTU:1480 Metric:1
    > RX packets:4 errors:0 dropped:0 overruns:0 frame:0
    > TX packets:4 errors:0 dropped:0 overruns:0 carrier:0
    > collisions:0 txqueuelen:0
    > RX bytes:416 (416.0 b) TX bytes:496 (496.0 b)
    >
    >hades:~# ip -6 route list
    >::/96 via :: dev 6to4 metric 256 mtu 1480 advmss 1420
    >2002::/16 dev 6to4 proto kernel metric 256 mtu 1480 advmss 1420
    >fe80::/64 dev eth0 proto kernel metric 256 mtu 1500 advmss 1440
    >fe80::/64 dev 6to4 proto kernel metric 256 mtu 1480 advmss 1420
    >ff00::/8 dev eth0 proto kernel metric 256 mtu 1500 advmss 1440
    >ff00::/8 dev 6to4 proto kernel metric 256 mtu 1480 advmss 1420
    >default via 2002:c058:6301:: dev 6to4 metric 1024 mtu 1480 advmss 1420
    >hades:~# ping6 -c4 -n www.ipv6.org
    >PING www.ipv6.org(2001:6b0:1:ea:a00:20ff:fe8f:708f) 56 data bytes
    >64 bytes from 2001:6b0:1:ea:a00:20ff:fe8f:708f: icmp_seq=1 ttl=250 time=207 ms
    >64 bytes from 2001:6b0:1:ea:a00:20ff:fe8f:708f: icmp_seq=2 ttl=250 time=206 ms
    >64 bytes from 2001:6b0:1:ea:a00:20ff:fe8f:708f: icmp_seq=3 ttl=250 time=177 ms
    >64 bytes from 2001:6b0:1:ea:a00:20ff:fe8f:708f: icmp_seq=4 ttl=250 time=78.5 ms
    >
    >--- www.ipv6.org ping statistics ---
    >4 packets transmitted, 4 received, 0% packet loss, time 3030ms
    >rtt min/avg/max/mdev = 78.547/167.637/207.698/52.821 ms
    >
    >Anyone see any problems with this?
    >
    > MikaL
    >
    >
    >
    >------------------------------------------------------------------------
    >
    >--- route.c.org 2003-07-11 16:41:55.000000000 +0300
    >+++ route.c 2003-07-11 16:42:16.000000000 +0300
    >@@ -743,7 +743,7 @@
    > some exceptions. --ANK
    > */
    > err = -EINVAL;
    >- if (!(gwa_type&IPV6_ADDR_UNICAST))
    >+ if (!(gwa_type&(IPV6_ADDR_UNICAST|IPV6_ADDR_ANYCAST)))
    > goto out;
    >
    > grt = rt6_lookup(gw_addr, NULL, rtmsg->rtmsg_ifindex, 1);
    >--- sit.c.org 2003-07-11 16:57:53.000000000 +0300
    >+++ sit.c 2003-07-11 17:17:42.000000000 +0300
    >@@ -495,10 +495,13 @@
    > addr_type = ipv6_addr_type(addr6);
    > }
    >
    >- if ((addr_type & IPV6_ADDR_COMPATv4) == 0)
    >- goto tx_error_icmp;
    >+ if ((addr_type & IPV6_ADDR_COMPATv4))
    >+ dst = addr6->s6_addr32[3];
    >+ else
    >+ dst = try_6to4(addr6);
    >
    >- dst = addr6->s6_addr32[3];
    >+ if (!dst)
    >+ goto tx_error_icmp;
    > }
    >
    > if (ip_route_output(&rt, dst, tiph->saddr, RT_TOS(tos), tunnel->parms.link)) {
    >
    >


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