https://bugs.exim.org/show_bug.cgi?id=2953
--- Comment #4 from Jeremy Harris <jgh146exb@wizmail.org> ---
(In reply to Jasen Betts from comment #3)
> The seems to be on the caller to guess which of ip6 or ip4 the mx record
> will resolve to this time.
Docs say:
"The first interface of the correct type (IPv4 or IPv6)
is used for the outgoing connection" (the "interface" option takes a list) -
so that does not seem to be so.
SO_BINDTODEVICE in Linux socket(7) seems relevant, but implies that
> exim binds the outgoing socket to the ip address I give for interface every time
might even be restrictive; that if you spec addr "A" for an interface that also
has
a "B" for a different subnet, you won't be able to connect to hosts on that "B"
net.
This feels like something that will differ across network-stack
implementations, too.
Anyone feel like testing it?
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--- Comment #4 from Jeremy Harris <jgh146exb@wizmail.org> ---
(In reply to Jasen Betts from comment #3)
> The seems to be on the caller to guess which of ip6 or ip4 the mx record
> will resolve to this time.
Docs say:
"The first interface of the correct type (IPv4 or IPv6)
is used for the outgoing connection" (the "interface" option takes a list) -
so that does not seem to be so.
SO_BINDTODEVICE in Linux socket(7) seems relevant, but implies that
> exim binds the outgoing socket to the ip address I give for interface every time
might even be restrictive; that if you spec addr "A" for an interface that also
has
a "B" for a different subnet, you won't be able to connect to hosts on that "B"
net.
This feels like something that will differ across network-stack
implementations, too.
Anyone feel like testing it?
--
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