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Old 01-26-2009, 03:19 PM   #1
Registered: Sep 2006
Location: India
Distribution: Redhat and Suse
Posts: 75

Rep: Reputation: 15
IPv6 DNS queries being sent on SLES servers even though disabled by configuration

We are seeing IPv6 DNS queries being sent on SLES servers.
We have disabled ipv6 module from the kernel, and are noticing this behaviour only on some applicaitons like wget, telnet

A similar issue can be found here =>

Verified that IPv6 parameter is disabled.
fcxws487:~ # dmesg|grep -i ipv6
fcxws487:~ # lsmod|grep -i ipv6
fcxws487:~ # ifconfig
eth0 Link encap:Ethernet HWaddr 00:1F:29:E0:0A:EC
inet addr: Bcast: Mask:
RX packets:227179 errors:0 dropped:0 overruns:0 frame:0
TX packets:421805 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:42150428 (40.1 Mb) TX bytes:591689006 (564.2 Mb)
Interrupt:16 Memory:f8000000-f8012100

lo Link encap:Local Loopback
inet addr: Mask:
RX packets:9777 errors:0 dropped:0 overruns:0 frame:0
TX packets:9777 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1139878 (1.0 Mb) TX bytes:1139878 (1.0 Mb)"

kporeddy@fcxws487:~ $ more /etc/modprobe.conf.local
# please add local extensions to this file
options qla2xxx ql2xfailover=0
install ipv6 /bin/true

See the Log entries [These are the log on the DNSs side for telnet commands manually being typed out of the box]

plewis12@b2cdns2:/var/adm$ tail -f query.log | grep
22-Jan-2009 16:20:13.709 XX+/
22-Jan-2009 16:20:18.710 XX+/
22-Jan-2009 16:20:23.709 XX+/
22-Jan-2009 16:20:28.710 XX+/
22-Jan-2009 16:20:33.711 XX+/


dns, ipv6

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