> [ylg]=> Yes, that's exactly wee need, a socket option like :
> int on = 1;
>
> setsockopt(fd, IPPROTO_IPV6, IPV6_DONTFRAG, &on, sizeof(&on));
> to disable fragmentation for UDP/Raw sockets (and of course on = 0 to
> (re)enable fragmentation which would be the default).
I'll add it to 2292bis.
> As we said in a previous message, F. Dupont and me, a useful option would be
> a new option to getsockopt() to get the outgoing MTU. For example, it helps
> tracemtu to discover the right mtu to start (otherwise, we have to set
> IPV6_DONTFRAG option, and try successive MTU (choosen in a list of possible
> MTU, ordered decreasingly) until we don't get EMSGSIZE error (an other pb :
> does exist such a list, i.e. the (right) list of all possible MTUs?).
Presumably such an option needs to take a sockaddr_in6 as an argument
to specify the destination. We can reuse the proposed ip6_mtuinfo structure
for this.
Do you care to know whether the kernel has path mtu information or
is just returning the mtu of the outgoing interface?
Erik
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