IPv6 and IPv4 resolver preferences

[Felipe Alfaro Solana]

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".