IPv6 and IPv4 resolver preferences
Felipe Alfaro Solana
felipe_alfaro at linuxmail.org
Thu Sep 16 23:02:41 UTC 2004
On Sep 17, 2004, at 00:21, Steve G wrote:
>
>> What's going on here?
>
> You told me everything except what you typed on the command line. :)
I typed "telnet hostB" :-)
Note this is the "telnet" client from package "krb5-workstation" (not
the actual telnet command that is used in non-Kerberized FC
installations), which is located in "/usr/kerberos/biin/telnet".
> I'm guessing that you typed a name and not a number, so the
> application looked it
> up and found multiple records. The application can also set a hint as
> to what
> address family to return. The default is in /etc/resolv.conf.
>
> If a query returns multiple records, the application must walk through
> the list
> and use the right one. I found this out a couple years ago when I was
> working on
> xinetd's IPv6 code.
>
> While dns queries may work OK, the applications may be broken as Joe
> suggested. I
> use IPv6 pretty regular and haven't noticed problems. I'll play with
> it some
> more, too.
It could be. Maybe "telnet" from "krb5-workstation" is broken, as "ssh"
seems to work correctly: it gives automatic preference to IPv6 over
IPv4, even when "options inet6" is *not* set in "/etc/resolv.conf".
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