roundrobin and spec. bowsers

Bastian Zacher bastian.zacher at aspect-online.de
Fri Dec 19 10:58:40 UTC 2003


Simon Hobson wrote:
> 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.
> 
How, if I don't have permanent access to change the records...
> 
> 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.
> 
Seems that the TTL doesn't have any affect to the behavior. But I can't 
imagine that mozilla/netscape can't handle this unlike IE.

Nevertheless, thanks for your support,

bastian
> Simon
> 



More information about the bind-users mailing list