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тАО08-09-2009 07:58 AM
тАО08-09-2009 07:58 AM
c7000 VC Ethernet module issues strange reverse lookup DNS requests
Every 6 to 7 *seconds* I find the following DNS lookup requests in my local DNS server's log:
15:50:42: query[PTR] 49.46.48.49.in-addr.arpa from 10.100.1.43
15:50:42: forwarded 49.46.48.49.in-addr.arpa to
15:50:44: query[PTR] 49.46.48.49.in-addr.arpa from 10.100.1.43
15:50:44: forwarded 49.46.48.49.in-addr.arpa to
10.100.1.43 is the first VC module.
The ISP's DNS server does not resolve the reverse lookup request because
49.48.46.49 appears to belong to an IANA reserved address range.
Why does the VC module even ask for this address? I went through all configuration pages I can imagine but am unable to find a place where this address is mentioned/configured - neither in the VCE nor in the VC domain config.
These lookups create unnecessary load on both my and the ISP's name server and result in a DNS log file of 10 to 20 times the size before the c7000 was installed.
Any idea why these lookups are done and how to stop them?
Thanks & regards,
Hans.
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тАО08-10-2009 12:38 AM
тАО08-10-2009 12:38 AM
Re: c7000 VC Ethernet module issues strange reverse lookup DNS requests
Best way is to download the OA config and log files and search them.
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тАО08-11-2009 01:04 PM
тАО08-11-2009 01:04 PM
Re: c7000 VC Ethernet module issues strange reverse lookup DNS requests
thanks for the suggestion. I downloaded the configuration and can't find any address except from my own LAN.
Any other ideas? Does noone else see the same phenomenon?
Thanks & regards,
Hans.
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тАО08-11-2009 01:26 PM
тАО08-11-2009 01:26 PM
Re: c7000 VC Ethernet module issues strange reverse lookup DNS requests
This does seem strange. Have any options been configured in your DHCP leases that may cause this?
Are DNS Server settings for your Active Onboard Administrator set properly?
If you use Enclosure Bay IP Addressing within the Active OA to give IPs to your interconnect modules rather than relying on your DHCP server, does the issue persist?
I may be grasping at straws, I admit I have not seen this before...
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тАО08-23-2009 12:04 PM
тАО08-23-2009 12:04 PM
Re: c7000 VC Ethernet module issues strange reverse lookup DNS requests
thanks for your suggestion. Due to some business assignments and vacation I won't be able to try it before September. I'll be back here once I know more.
Thanks & regards,
Hans.
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тАО01-15-2010 04:20 PM
тАО01-15-2010 04:20 PM
Re: c7000 VC Ethernet module issues strange reverse lookup DNS requests
A bit later I reset both VC Ethernet modules, the lookup requests were back. Then I reset the OA, the requests disappeared again.
As far as I can remember the sequence of events it appears that the requests always (mostly?) came from the standby module, whichever happened to have this role.
Hans.