topic Re: Allowing DNS requests via CSS in Application Networking

Allowing DNS requests via CSS

trevorj — Tue, 17 Feb 2004 16:15:57 GMT

Hi,

I've setup a CSS to load balance between 2 servers using layer3 balancing, but I discovered that when requesting a dns lookup (the two servers are acting as primary dns servers), I get the following response from a terminal nslookup:-

';; reply from unexpected source: 192.168.0.120#53, expected 192.168.0.101#53' Whereas 192.168.0.120 is the actual server IP and 192.168.0.101 is the VIP. Is this related to the dns server itself or the CSS?

- Trevor

Re: Allowing DNS requests via CSS

seilsz — Tue, 17 Feb 2004 16:38:04 GMT

Trevor,

This is due to the way the CSS handles UDP traffic. There are a couple of options for dealing with DNS, which you can find more information about here:

http://www.cisco.com/en/US/partner/products/hw/contnetw/ps789/products_tech_note09186a00801e05ee.shtml

~Zach

Re: Allowing DNS requests via CSS

trevorj — Tue, 17 Feb 2004 17:01:34 GMT

Oh, I dont have access to the URL 😞

- Trevor

Re: Allowing DNS requests via CSS

seilsz — Tue, 17 Feb 2004 17:22:03 GMT

Sorry. Try this one:

http://cisco.com/en/US/products/hw/contnetw/ps789/products_tech_note09186a00801e05ee.shtml

~Zach

Re: Allowing DNS requests via CSS

trevorj — Tue, 17 Feb 2004 17:41:43 GMT

Hey thanks, I created a group dns and it works fine!

- Trevor