--with-ipv4-default and sshd IPv4/6 dual bind hack

Damien Miller djm at mindrot.org
Mon Mar 5 23:23:49 EST 2001

On Mon, 5 Mar 2001, Pekka Savola wrote:

> Hello all,
> I just found a bug a nice bug that can be turned into a real feature on
> systems (usually Linux) that are built with --with-ipv4-default.
> If you enable IPv6 in kernel, and enable both listenaddress and
> ::, sshd will error out 'address family not supported'.
> However, you can work around this error by starting sshd with 'sshd -4 -6'.
> As far as man page is concerned, I'm getting the impression that you
> should be able to use only  -4 or -6, not both.

It may be that the reason for the hack has been fixed. Can someone
with a recent Linux kernel with IPv6 compiled in (or module loaded)
build OpenSSH without the --with-ipv4-default hack and see whether
it still waits ages for nameserver lookups at connect?


| Damien Miller <djm at mindrot.org> \ ``E-mail attachments are the poor man's
| http://www.mindrot.org          /   distributed filesystem'' - Dan Geer

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