Re: Firewall question

From: Lars M. Hansen (badnews@hansenonline.net)
Date: 03/15/03 

From: Lars M. Hansen <badnews@hansenonline.net>
Date: Sat, 15 Mar 2003 15:11:52 GMT

On Sat, 15 Mar 2003 14:26:57 -0000, Chris spoketh

>Besides, the mail server in question will only need to query MX
>records when sending out mail if not using a smart host. UDP 53 is all it
>needs.
>
>Chris.
>

That is an assumption. Since the OP never stated if there was anything
else on this server, or even if this server would make DNS request to an
external source at all. And in the event that this mail server uses an
RBL, it would need to request more than just MX records.

See my other post regarding TCP usage for DNS...

Lars M. Hansen
http://www.hansenonline.net
(replace 'badnews' with 'news' in e-mail address)

Relevant Pages

  • RE: Internet Connection Wizzard - Mail Delivery question
    ... you can choose smart host to route your e-mail. ... information in Internet Header, this is expected behave. ... Header will recorder the servers it passes, ... Using Microsoft Exchange Server 2003 Recovery Storage Groups ...
    (microsoft.public.windows.server.sbs)
  • RE: IP addresses and VPN
    ... UDP on all machines in the network or just the servers at each end of the VPN ... > Browser receives server announcements from another computer, ... > Microsoft CSS Online Newsgroup Support ... > This newsgroup only focuses on SBS technical issues. ...
    (microsoft.public.windows.server.sbs)
  • RE: mail not sent outside to smart host
    ... also cause DNS problems. ... Open DNS console in Administrative Tools, right click your Server Name, ... Exchange can not send mail to this smart host ... When opening a new thread via the web interface, we recommend you check the ...
    (microsoft.public.windows.server.sbs)
  • Re: mount.nfs internal error
    ... Whenever I try to mount from a server on my LAN, ... Adding a -o udp to the mount still fails ... Linux does not yet support nfs over IPv6, although rpcbind does support IPv6 queries.) ... 100000 4 tcp 111 portmapper ...
    (comp.os.linux.networking)
  • Re: NETDIAG problem - SPN queries
    ... Ethernet adapter Local Area Connection: ... Connection-specific DNS Suffix. ... There is no primary WINS server defined for this adapter. ... Description: RSVP UDP Service Provider ...
    (microsoft.public.win2000.dns)