RE: [cobalt-users] [Qube 3] Mail Sending Problem

["Andy Brown" <andy.brown@xxxxxxxxxxxxx>]

> -----Original Message-----
> From: Brian R. Poppenwimer [mailto:popper@xxxxxxxxxx]
> Sent: 05 October 2001 19:12
> To: cobalt-users@xxxxxxxxxxxxxxx
> Subject: RE: [cobalt-users] [Qube 3] Mail Sending Problem
> 
> 
> *****   BIG SNIP   *****
> ->------Original Message-----
> ->-
> ->-
> ->-Probably not the case, but have you checked the DNS records for the
> ->-remote machines?? As typical time-outs like you're describing sound
> ->-classic of failing DNS.
> ->-Quick test is for the example above, getting onto the rack 
> ->-and doing an
> ->-nslookup on their address and see if it can resolve the IP 
> ->-address to a
> ->-host-name. If not, then that could be the heart of the 
> problem here.
> ->-
> ->-
> ->-Hopefully some pointers!! Can't come up with anything more 
> specific.
> ->-
> ->-Andy
> ->-http://www.ineedlinux.info
> ->-
> 
> Well thanks for all the help, it is helping.  This could be the case
> (and here we go showing my lack of dns & Linux knowledge).  But the
> addresses of my internal network nodes are not defined in any dns
> record, I did not think they needed to be defined because they are
> internal, they are just ips assigned by the dhcp server.  
> What has to be
> done to resolve this?  Do I need to define the whole ip range 
> in dns for
> my internal network, and what affect will this have on my dns records,
> since my dns server is a the primary dns server for my domain, will it
> try to supply these ips, even though they are not legal, to 
> the outside
> world?  Is there something else I should do, I was reading up on
> /etc/host.conf file, is that something that affects this also.  Sorry
> for all the basic questions, I'm trying to learn, but when they fire
> your assistant and you have to worry about so much by 
> yourself, certain
> things get ignored (lame excuse I know).
> Thanks a lot for all the help,
> ---Brian
> 
> 
> ==========================================
> Brian R. Poppenwimer, CNE, MCP
> popper@xxxxxxxxxxxxxxx
> Director Of Computer Operations
> Nelson & Pope
> www.nelsonpope.com


Just as an extra note, i've written quite a bit about DNS on a linux-faq
site, hopefully it might help explain or at least give some pointers for
the bewildered out there!
	http://ineedlinux.info


Andy
http://www.ineedlinux.info
http://www.linuxnetworking.co.uk