in net/ipv6/sit.c: iph->ttl = tiph->ttl
so, the ip header gets the same ttl as the tunneled ip packet.
if the tunnel is A -> B and there are 10 ipv4 hops inside the tunnel,
a traceroute6 will show 10 "no response" hops.
with other operating systems, you don�t see this, every ipv6 tunnel
is a "virtual single link", so you only see two hops: ipv6 of A and ipv6 of B,
and no "no response" hops at all.
is this a bug in linux sit tunnels ?
andreas
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