Forum OpenACS Q&A: Is it DNS or me?

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1: Is it DNS or me?
Posted by Brian Mueller on 05/01/00 04:47 PM
My OpenACS site is inaccessible, I'm trying to ascertain if there's a
DNS problem, but want to know if these symptoms look familiar to
anyone.
There are 2 sites hosted by AOLserver on this machine:
knowledgegarden.org at 12.3.59.6 (acs site)
and
mfeldstein.com at 12.3.59.7 (static pages)

Address - Behavior
http://12.3.59.6 - Cannot find server or DNS Error

http://12.3.59.7 - successful connection to mfeldstein.com

http://12.3.59.6:9876 - successful connection to the site
administration pages

http://knowledgegarden.org - Cannot find server or DNS Error

http://mfeldstein.com - Cannot find server or DNS Error

http://knowledgegarden.org:9876 - Cannot find server or DNS Error

I can telnet to the machine at 12.3.59.6
Restarting AOLserver, log looks normal.

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2: Response to Is it DNS or me? (response to 1)
Posted by Ben Adida on 05/01/00 04:56 PM
Okay, the DNS is definitely screwed, knowledgegarden.org doesn't resolve for me. Try taking out your "Host" parameter from your config file and see if you then reach your site at the IP address directly.

Another problem, though, check this out: 

 8  gbr2-a31s1.n54ny.ip.att.net (12.127.0.18)  59.390 ms  38.985 
ms  39.703 ms
 9  ar1-p310.rp2nj.ip.att.net (12.123.192.65)  39.625 ms  38.384 
ms  59.990 ms
10  12.124.190.66 (12.124.190.66)  39.204 ms  29.737 ms  
38.767 ms
11  12.3.59.6 (12.3.59.6)  39.602 ms  39.100 ms  49.625 ms
12  12.3.59.6 (12.3.59.6)  3037.639 ms !H  3027.372 ms !H  
3037.708 ms !H
Tracerouting to your .7 box seems to go through .6 and then has issues there... I'm not networking expert, but that looks weird.
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3: Response to Is it DNS or me? (response to 1)
Posted by Brian Mueller on 05/01/00 06:35 PM
12.3.59.7 is an alias address assigned to a dummy device in linux; 12.3.59.6 is the real IP address. Maybe I didn't implement this correctly, although its been working for about 2 weeks.
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4: Re. dummy device (response to 1)
Posted by Robert Schöftner on 05/06/00 08:44 PM
perhaps you shouldn't ifconfig dummy, but enable aliasing and do something like
ifconfig eth0:1 12.3.59.7 etc...
(or ip addr add 12.3.59.7 dev eth0 if using the new userland-tools)

then at least traceroute will work as excepted