[syslog-ng] 'network' Destination With Hostname Resolution (IPv4 vs IPv6)

[Balazs Scheidler]

Ip protocol v6 should support both ipv4 and v6. So if you use that and the
name resolves to a v4 address or should work.

On Wed, Sep 19, 2018, 19:23 David Hauck <davidh at netacquire.com> wrote:

> Hi,
>
> Thought I would reach out again to see if anyone had any thoughts on the
> item below.
>
> Thanks for the consideration,
> -David
>
> On Wednesday, September 12, 2018 3:39 PM, syslog-ng <
> syslog-ng-bounces at lists.balabit.hu> On Behalf Of David Hauck wrote:
> > Hi,
> >
> > I have a question regarding how to specify a network destination when
> using a hostname when the
> > hostname can be resolved to either IPv4 or IPv6. In particular what
> should be specified by the ip-
> > protocol() parameter? There are some configuration scenarios and/or
> target installations that don't
> > know a priori whether the DNS configuration will resolve to an IPv4 or
> IPv6 address.
> >
> > E.g.,
> >
> > destination d_tcp6 {
> >     network(
> >         "myhost"
> >         port(514)
> >         transport(udp)
> >         ip-protocol(6 or 4 or ??)
> >         );
> > };
> >
> > It seems like it would simple enough to have syslog-ng simply validate
> the resulting IP address string to
> > determine which of ip-protocol(4) or ip-protocol(6) is actually needed.
> In fact, I would argue that
> > specifying an IP address string (as the "<destination-address>" value)
> could result in the same
> > determination (the address string necessarily unambiguously determines
> whether the reference is an
> > IPv4 or an IPv6 address and I would think there is a 1-1 relationship
> between this determination and
> > whether ip-protocol(4) or ip-protocol(6) is used - (in other words it
> would never make sense to have
> > these mixed: "::1" and ip-protocol(4) would be invalid).
> >
> > Thanks, -David
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