misc/163482: IP address is not round robined if DNS name has many IPs

[Eugen Konkov]

>Number:         163482
>Category:       misc
>Synopsis:       IP address  is not round robined if DNS name has many IPs
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Dec 20 18:10:11 UTC 2011
>Closed-Date:
>Last-Modified:
>Originator:     Eugen Konkov
>Release:        
>Organization:
ISP FreeLine
>Environment:
>Description:
# nslookup
> set debug
> vpn.in
Server:         127.0.0.1
Address:        127.0.0.1#53

------------
    QUESTIONS:
        vpn.in, type = A, class = IN
    ANSWERS:
    ->  vpn.in
        internet address = 10.11.19.54
        ttl = 10
    ->  vpn.in
        internet address = 10.5.0.17
        ttl = 10
    AUTHORITY RECORDS:
    ->  vpn.in
        nameserver = vpn.in.
        ttl = 10800
    ADDITIONAL RECORDS:
------------
Name:   vpn.in
Address: 10.11.19.54
Name:   vpn.in
Address: 10.5.0.17
> ^C
# date
Tue Dec 20 19:56:31 UTC 2011
# ping vpn.in
PING vpn.in (10.11.19.54): 56 data bytes
64 bytes from 10.11.19.54: icmp_seq=0 ttl=64 time=0.173 ms
64 bytes from 10.11.19.54: icmp_seq=1 ttl=64 time=0.167 ms
^C
--- vpn.in ping statistics ---
2 packets transmitted, 2 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 0.167/0.170/0.173/0.003 ms

# date
Tue Dec 20 19:57:04 UTC 2011
flux# ping vpn.in
PING vpn.in (10.11.19.54): 56 data bytes
64 bytes from 10.11.19.54: icmp_seq=0 ttl=64 time=0.149 ms
64 bytes from 10.11.19.54: icmp_seq=1 ttl=64 time=0.194 ms
^C
--- vpn.in ping statistics ---
2 packets transmitted, 2 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 0.149/0.171/0.194/0.023 ms

but if I ping vpn.in with interval 15 sec from Windows (that machine has same DNS server as this one)
I get different IPs for domain name vpn.in
>How-To-Repeat:

>Fix:
add 
 zone "vpn.in" {
     type master;
     file "/etc/namedb/master/vpn.in.fwd";
     };
to /etc/namedb/named.conf

create file /etc/namedb/master/vpn.in.fwd
$TTL 3h                 ;Serial, Refresh, Retry, Expire, Neg. TTL

@       SOA     localhost. nobody.in.   2011122001      1d 2h 100d 3h
                NS      @

        10      A       10.5.0.17
        10      A       10.11.19.54

set resolve.conf
nameserver 127.0.0.1
or set the IP address the bind is listening on.
On windows host add DNS server to host with this bind.

Try to ping from FreeBSD and Windows

>Release-Note:
>Audit-Trail:
>Unformatted: