From owner-freebsd-questions  Wed Aug  4 14:59:23 1999
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Date: Wed, 04 Aug 1999 15:57:16 -0600
Subject: Re: sendmail no longer relaying, now giving me 'Host unknown'
	 error
From: "Dan Lazin" <dan@esther.su.ualberta.ca>
To: andyo@prime.net.ua
Cc: freebsd-questions@freebsd.org
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> Well, resolver got the MX records for geocities.com and
> this is strange that U couldnt connect to any of
> mailexchangers. Could U tcpdump ur telnet on 25 port to
> any of them using domainnames and IPs that I supplied below:
> mail.geocities.com      internet address = 209.1.224.30
> mail.geocities.com      internet address = 209.1.224.29
> mail.geocities.com      internet address = 209.1.224.139
> mail.geocities.com      internet address = 209.1.224.42
> mail.geocities.com      internet address = 209.1.224.138
> mail.geocities.com      internet address = 209.1.224.44
> mail??.geo.yahoo.com    internet address = 206.251.17.77
> (last 4 have the same IP).

I can telnet on port 15 to those IPs just fine, put telneting
to the hostname fails with 'unknown host'. This happens for both
mail.geocities.com and mail??.geo.yahoo.com.

If I do an nslookup on either of those hosts, it returns the correct IPs.
nslookup is using 129.128.5.233 as its default nameserver, which is the
University of Alberta's primary upstream NS, and the (only) one specified in
my resolv.conf.

> Well, now U should check ur resolver&bind configuration.
> If U run local bind U have to have /etc/resolve.conf smth like
> this:
>
> domain          ur.isp.domain.name
> nameserver      [127|10|192|177].0.0.1 195.64.229.1
>
> if no local bind- just:
> domain          ur.isp.domain.name
> nameserver      195.64.229.1

Looks like the second one.

> then use nslookup to query ur bind and check answers.
> for this purpose man nslookup will help U.

What should I be checking with nslookup? All the domain names I check
resolve to IPs just fine.

I think that this is the reason that my relaying is failing, too: sendmail
can't verify my hostname, so it's not checking it against relay-domains.

Should I set a different nameserver in resolv.conf?

Dan


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