Unreachable host DNS problem on

I've had intermittent problems reaching my web and mail servers. Tonight when I ping mail.vihinfo.net I get "cannot resolve mail.vihinfo.net" from my local machine, but testing from another machine (reached via Timbuktu) I can ping and traceroute mail.vihinfo.net without any problems.

What's strange is that other domains on the same host can be reached, for example www.vihinfo.net works just fine.

Where is mail.domain.com actually set up? My configuration was working fine with ISP Config's Create MX checked for each co-domain I set up. However, I added separate records for each mail.x.y instance. Is this correct or is it likely to cause more problems, given that I have checked the Create MX record box for every co-domain instance?


From DNSreport.com I get:

/etc/resolv.conf

iptables -L

/etc/hostname

 

Two examples from domains that are causing me trouble:
mail.domain.net won't lookup or www.domain.net won't lookup but domain.net (without the www) will look up and resolve properly.


DNS Entry
Title: papamamanbebe.net
Server: dz
Domain (SOA): papamamanbebe.net
IP Address 88.191.14.190

Nameserver1: 88.191.14.190
Nameserver2: 88.191.254.71

Refresh: 28800
Retry: 7200
Expire: 604800
TTL: 86400

A Record
IP-Adresse - Hostname
88.191.14.190 - www
88.191.14.190 - mail

CNAME: nothing

MX
Mailserver - Hostname
sd-1494.dedibox.fr - www
sd-1494.dedibox.fr - mail

SPF - nothing

Another example

Server: dz
Domain: vihinfo.net
IP Address: 88.191.14.190

Nameserver 1: 88.191.14.190
Nameserver 2: nssec.dedibox.fr

Refresh/retry/Expire/TTL = as above

A Record
IP-Adresse - Hostname
88.191.14.190 - www
88.191.14.190 - mail

MX
Mailserver - Hostname
mail.vihinfo.net -
sd-1494.dedibox.fr - mail

 

/var/lib/named/etc/bind/pri.papamamanbebe.net

Code:

$TTL        86400
@       IN      SOA     88.191.14.190. admin.papamamanbebe.net. (
                        2007030501       ; serial, todays date + todays serial #
                        28800              ; refresh, seconds
                        7200              ; retry, seconds
                        604800              ; expire, seconds
                        86400 )            ; minimum, seconds
;
                NS      88.191.14.190.              ; Inet Address of name server 1
                NS      88.191.254.71.              ; Inet Address of name server 2
;

www  MX      10 sd-1494.dedibox.fr.
mail  MX      10 sd-1494.dedibox.fr.

papamamanbebe.net.      A        88.191.14.190
www       A       88.191.14.190
mail       A       88.191.14.190

;;;; MAKE MANUAL ENTRIES BELOW THIS LINE! ;;;;

 

Code:

                NS      88.191.14.190.              ; Inet Address of name server 1
                NS      88.191.254.71.              ; Inet Address of name server 2

Your NS needs to be a name, and not an IP!

You will need to create two A record's with NS1 and NS2 pointing to 88.191.14.190 and 88.191.254.71

It should look something like this:

Code:

$TTL        86400
@       IN      SOA     88.191.14.190. admin.papamamanbebe.net. (
                        2007030501       ; serial, todays date + todays serial #
                        28800              ; refresh, seconds
                        7200              ; retry, seconds
                        604800              ; expire, seconds
                        86400 )            ; minimum, seconds
;
                NS      ns1.papamamanbebe.net.              ; Inet Address of name server 1
                NS      ns2.papamamanbebe.net.              ; Inet Address of name server 2
;

www  MX      10 sd-1494.dedibox.fr.
mail  MX      10 sd-1494.dedibox.fr.

papamamanbebe.net.      A        88.191.14.190
www       A       88.191.14.190
mail       A       88.191.14.190
ns1       A       88.191.14.190
ns2       A       88.191.254.71


;;;; MAKE MANUAL ENTRIES BELOW THIS LINE! ;;;;

 

hi,

same problem here.

i have differnet domais (vhosts)
- gz.intranet.paf...
- mysql.intranet.paf..

Now i added a new one: rep.intranet.paf...

this entry is unreachable. I tried a lot: restarted the server, make the entry for the records manualy

the suggestion edge postet i tried too. No changes ... still unreachable.

It's one machine with one ip-adress ... only 5 records ... 4 work fine and one is not reachable.

Now ... what to do to fix that problem??

Thx.

 

You will need to fix this also, or your mail will not work.

Use e.g.

Code:

dig @localhost MX domain.tld

to test your local DNS setup. Look in the log files to check for errors.

 

i have no MX records

So ... i deleted rep.intranet....

The next try to create a new subdomain ... the same result.

I tried:

Code:

dig @localhost A de.intranet.paf.de.kaufland

and got:

Code:

; <<>> DiG 9.2.4 <<>> @localhost A de.intranet.paf.de.kaufland
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1639
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 0

;; QUESTION SECTION:
;de.intranet.paf.de.kaufland.   IN      A

;; ANSWER SECTION:
de.intranet.paf.de.kaufland. 86400 IN   A       10.128.218.9

;; AUTHORITY SECTION:
intranet.paf.de.kaufland. 86400 IN      NS      10.128.218.9.
intranet.paf.de.kaufland. 86400 IN      NS      10.128.217.104.

;; Query time: 1 msec
;; SERVER: 127.0.0.1#53(localhost)
;; WHEN: Tue Mar  6 14:21:00 2007
;; MSG SIZE  rcvd: 115

seems to be ok??

Log-Files tell me no error ...

 

The output looks like it should be.

Is DNS listening on the external IP's? You can check with

Code:

netstat -tap

 

i cleaned up the database (deleted old entrys) and now it works.

dont know why.

thx so far

 

My mail is working just fine, except for the unknown host problem described.

What's wrong with having my mail exchanger at the "main" domain name?

How do I fix this?

Do I manually edit the config file?

Or do I make changes in ISPConfig?

 

Do it in ISPconfig!

ISPconfig > DNS manager > and select the domain.
Now create an A record with hostname: ns1 and IP Address: 88.191.14.190 and ns2 and IP Address: 88.191.254.71

If this is your default NS1 and NS2, than you might also need to set Default NS1 and Default NS2 in ISPconfig > Management > Settings > DNS to the ns1.papamamanbebe.net and ns2.papamamanbebe.net

 

This means mail needs to be addressed to [email protected].

If you want to receive mail, I assume you would want [email protected]. You can remove the hostname in the Panel in the MX record area. (DNS)

 

it's me again.

Now there are 2 other domains, i can not reach.

Ping from workstation AND from Server told me "unkown host".

Both domains worked fine in the past. But now: unkown host.

What can i do now?

 

it is unbelievable ... today one of the domains is working.

But i have changed nothing!

Any Ideas?

 

on an intranet-server for a local network?

all domains work immediately when i added them. A few days later the first domain stopped working and again a few days later the 2nd domain stopped working.

Then (see above) i tried and tried and tried ... but nothing happend.

But now ... the 2nd domain is working and i changed nothing for at least one week.

I dont understand that ... ok, im not a dns-expert ...