Please help with sendmail problem

[Jerry Feldman]

Sendmail.cw is not your sendmail.cf file. 
Also, mediaone.net validates your Mac Address, so to be hot swappable, you 
need to be able to spoof the MAC addresses.
What you are doing is doable in sendmail, but I'm not sure how, There is an 
O'Reilly book on sendmail, which I happen to have.
Bill Horne wrote:
> "Jerry Feldman" <gaf at blu.org> wrote:
> 
> >You've got one problem here because union.ne.mediaone.net is a valid 
> >mediaone host name. I strongly suggest that you name the hosts on your 
> >internal net with a different domain, such as horne.net or something.
> >Your sendmail.cw file is used for host forwarding.
> 
> Is that the sendmail.cf file, or a different one? Sorry if this is
> obvious, but sendmail's not my area of expertise.
>                       ^
> 
> >Checkout  http://www.sendmail.org/ for tips and faqs. 
> 
> Will do. (But see below)
> 
> >Bill Horne wrote:
> >> Thanks for reading this: I'm having a problem with sendmail and need help.
> >> 
> >> I've got an entry in my /etc/hosts file for a machine on my home network, 
> e.g
> >> .,
> >> 
> >> 10.50.50.72   union.ne.mediaone.net
> >> 
> >> Also, in the /etc/hosts.conf file, the entry is "order hosts,bind".
> >> 
> >> However, sendmail, when trying to deliver mail to a user on union.ne.media
> one
> >> .net, is doing a dns lookup *before* checking the hosts file, and is obtai
> ning
> >> an incorrect address that has not yet aged off mediaone's nameservers.
> >> 
> >> How do I force sendmail to check the /etc/hosts file first?
> >> 
> >> TIA.
> >> 
> >> Bill Horne
> 
> I should apologize for not giving more details: the objective here is to
> set up a hot-swappable machine, which can be plugged into the cable
> modem and assume its duties without reconfiguration. To that end, it has
> been set up with DHCP so that it'll work with the cable modem if I need
> to connect it directly, and when the Linux box is in between it and the
> modem, Linux uses a "fixed-address" DHCP parameter to lock the "union"
> machine to a known IP on my detached network. The "union" box has
> software on it which requires a domain name and can't get it from DHCP,
> so using a "phantom" domain isn't my first choice.
> 
> For that reason, I'd like to keep the "union.ne.mediaone.net" domain
> name in the box if possible: I'd like the Linux router/firewall to use
> the detached address when it's on line, but to have the "union" machine
> revert to "dumb wintel" mode if I need to plug it into the modem
> directly.
> 
> We all know crashes happen at the worst times: for me, they're always
> when I don't have two brain cells to rub together and my wife is in need
> of the net. Ergo, I want hot swap capability, where moving a patch cable
> and a reboot is all that's needed to get the machine going.
> 
> If sendmail is hard-coded to do a DNS lookup, I'll use a different MTA,
> but I want to solve this problem instead of going through another MTA's
> learning curve. So, to restate: how do I force sendmail to check (and
> believe) the "hosts" file instead of doing a DNS lookup?
> 
> Bill
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-- 
Jerry Feldman <gaf at blu.org>
Boston Linux and Unix user group
http://www.blu.org