roundrobin and spec. bowsers

Simon Hobson shobson0309 at colony.com
Thu Dec 18 17:45:27 UTC 2003


Bastian Zacher wrote:

>I'm currently experiencing with the bind's RoundRobin. I have two
>webservers with the same dns-record pointing to different ips.
>
>webserver	30	IN	A	192.168.1.10
>webserver	30	IN	A	192.168.1.11
>
>The TTL is set to a very low value. Now, if a brower is connecting,
>any webserver should answering depending which ip bind will forward to
>the client.
>When I turn of one of the webservers, the Client should connect to the
>other server to receive the pages. Only IE is doing as expected, Mozilla
>and Netscape won't ask for the other ip or whatever. The result is a
>error message that the server isn't available. After restarting Mozilla
>everything's doing fine.

If one server is down, you should not be giving out it's IP. Further, 
if you know that you are going to take down one server, you should 
remove it's IP from DNS in sufficient time for any cached records to 
expire.

If you don't do this, then some browsers are going to try and connect 
to the downed server, and they will time out. It is an implementation 
specific thing what any client does if you give it multiple IPs for 
one server - it is perfectly valid for them to only attempt to 
connect to one.

Simon

-- 

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Simon Hobson, Technology Specialist
Colony Gift Corporation Limited
Lindal in Furness, Ulverston, Cumbria, LA12 0LD
Tel 01229 461100, Fax 01229 461101

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