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
>
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