Two problem with the DNS (hostname order and slow internal DNS)

Hi,
First I'm sorry for my english,... So I've two questions which I cannot solve by myself.
1/ I configured two DNS as primary on my Xserve one .com and one .ch. For the same name : example.com and example.ch. I defined a mail server, my second Xserve.
If only my example.ch is configured on my DNS server my hostname is mail.example.ch, working fine with my specific MySQL software. But if I add the example.com to my DNS Server, my hostname is changed to mail.example.com !
And that I do not want ! I need to keep my mail.example.ch. How can I fix my hostname to the .ch ?
2/We have an Xserve with two Ethernet cards (for the NAT) and we have a DNS server on this computer. When I use the Xserve for DNS Server on the remote computer network preferences the internet is working but very slow to resolve the DNS. I think the problem is from the catching DNS system, but how I can disable that or speed up my internet connection ?
Regards,
Florent

Thanks but my DNS is working fine now. My last
problem is my hostname.
Have a look in /etc/hostconfig. HOSTNAME defaults to -AUTOMATIC- which resolves by firstly trying reverse lookup on its IP - the first return from this will be adopted. If you have 2 PTR records for the IP then it may be resolving to the 'wrong' one. If this is the case then you could either...
1. Remove one of the PTR records, or
2. Edit /etc/hostconfig, replacing with HOSTNAME=mail.example.ch
-david

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