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Thread: Strange domain-name resolving - strings are appended

  1. #1
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    Default Strange domain-name resolving - strings are appended

    Hi all,

    We have this strange same problem with a goofy error and this is happening quite often in our zimbra implementation - the appended string to the domain-name varies and it seems to be depending on how many strings the user-name has before the @ divider - e.g. sometimes it's
    userabc@domain.ain.com and when there is 1 less char it's userab@domain.main.com - Seems to be more a regex string extraction issue to

    me than a miss-configured DNS record or so, else the appended string should be always the same - Would have anyone an idea what could cause this issue or how to track it down to pin-point the root-cause?

    Here are some output's from the Split_dns how-to.
    note: the string domain is place-holder for our real domain.



    1) host $(hostname)
    zimbra.domain.com has address xx.xx.xx.202
    zimbra.domain.com mail is handled by 40 dddd.domain.com.

    2) dig domain.com mx

    ; <<>> DiG 9.3.2-P2.3 <<>> domain.com mx
    ;; global options: printcmd
    ;; Got answer:
    ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 39944
    ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 3, ADDITIONAL: 4

    ;; QUESTION SECTION:
    ;domain.com. IN MX

    ;; ANSWER SECTION:
    domain.com. 75585 IN MX 10 dddd.domain.com.

    ;; AUTHORITY SECTION:
    domain.com. 53332 IN NS ns3.do.domain.net.
    domain.com. 53332 IN NS ns2.domain.de.
    domain.com. 53332 IN NS ns1.do.domain.net.

    ;; ADDITIONAL SECTION:
    dddd.domain.com. 36520 IN A xx.xxx.xxx.25
    ns1.do.domain.net. 14691 IN A xx.xxx.xxx.31
    ns2.domain.de. 14691 IN A xx.xxx.xx.31
    ns3.do.domain.net. 14691 IN A xx.xx.xxx.53

    ;; Query time: 0 msec
    ;; SERVER: 10.x.x.53#53(10.x.x.53)
    ;; WHEN: Thu May 26 13:10:09 2011
    ;; MSG SIZE rcvd: 189


    3) dig domain.com any

    ; <<>> DiG 9.3.2-P2.3 <<>> domain.com any
    ;; global options: printcmd
    ;; Got answer:
    ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 33316
    ;; flags: qr rd ra; QUERY: 1, ANSWER: 6, AUTHORITY: 3, ADDITIONAL: 4

    ;; QUESTION SECTION:
    ;domain.com. IN ANY

    ;; ANSWER SECTION:
    domain.com. 75383 IN MX 10 dddd.domain.com.
    domain.com. 9058 IN TXT "v=spf1 ip4:xx.xxx.xxx.202 a:zimbra.domain.com ip4:xx.xxx.xxx.212 a:maildo.domain.com

    ip4:xx.xxx.xxx.25 a:ddd.domain.com a:smtp.do.domain.com -all"
    domain.com. 4889 IN A xx.xxx.xx.13
    domain.com. 53130 IN NS ns2.domain.de.
    domain.com. 53130 IN NS ns3.do.domain.net.
    domain.com. 53130 IN NS ns1.do.domain.net.

    ;; AUTHORITY SECTION:
    domain.com. 53130 IN NS ns3.do.domain.net.
    domain.com. 53130 IN NS ns1.do.domain.net.
    domain.com. 53130 IN NS ns2.domain.de.

    ;; ADDITIONAL SECTION:
    dddd.domain.com. 36318 IN A xx.xxx.xxx.25
    ns1.do.domain.net. 14489 IN A xx.xxx.xxx.31
    ns2.domain.de. 14489 IN A xx.xxx.xx.31
    ns3.do.domain.net. 14489 IN A xx.xxx.xxx.53

    ;; Query time: 0 msec
    ;; SERVER: 10.x.x.53#53(10.x.x.53)
    ;; WHEN: Thu May 26 13:13:31 2011
    ;; MSG SIZE rcvd: 406

    4) cat /etc/resolv.conf
    domain domain.com
    search domain.com

    nameserver 10.x.x.53
    nameserver 10.x.x.14
    nameserver 10.x.x.15
    nameserver 10.x.x.16


    cat /etc/hosts
    127.0.0.1 localhost.localdomain localhost
    xx.xxx.xxx.202 zimbra.domain.com zimbra


    # The following lines are desirable for IPv6 capable hosts
    ::1 ip6-localhost ip6-loopback
    fe00::0 ip6-localnet
    ff00::0 ip6-mcastprefix
    ff02::1 ip6-allnodes
    ff02::2 ip6-allrouters
    ff02::3 ip6-allhosts
    Last edited by errolu; 05-26-2011 at 05:55 AM.

  2. #2
    phoenix is offline Zimbra Consultant & Moderator
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    Might it be the fact that the IP address in your hosts file is not the same IP address returned by your DNS A record (it should be)?
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

  3. #3
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    Quote Originally Posted by phoenix View Post
    Might it be the fact that the IP address in your hosts file is not the same IP address returned by your DNS A record (it should be)?
    Hi Bill,

    thanks for the feedback.

    Could you please point out which one(s) you mean?

    We might have some kind of a "complex" setup I think-
    The involved servers are all in the same domain, but have different IP's.

    We have the server called dddd.domain.com which does a grey-listing of the incoming mails before it forwards it to zimbra.domain.com - This might explain the different IP's in the A-Record output & the host file.

    I've unfortunately no access to dddd.domain.com (is the security-/nw-teams setup), but trying to get from them the same info's that need to be verified according to Split_dns how-to.

    -snip-
    ..
    ip4:xx.xxx.xxx.202 a:zimbra.domain.com
    ip4:xx.xxx.xxx.212 a:maildo.domain.com
    ip4:xx.xxx.xxx.25 a:dddd.domain.com a:smtp.do.domain.com -all"..
    -snip-

    Thnx!


    ****
    Hi all,

    We have this strange same problem with a goofy error and this is happening quite often in our zimbra implementation - the appended string to the domain-name varies and it seems to be depending on how many strings the user-name has before the @ divider - e.g. sometimes it's
    userabc@domain.ain.com and when there is 1 less char it's userab@domain.main.com - Seems to be more a regex string extraction issue to

    me than a missconfigured DNS record or so, else the appended string should be always the same - Would have anyone an idea what could cause this issue or how to track it down to pin-point the root-cause?

    Here are some output's from the Split_dns how-to.
    note: the string domain is place-holder for our real domain.



    1) host $(hostname)
    zimbra.domain.com has address xx.xx.xx.202
    zimbra.domain.com mail is handled by 40 dddd.domain.com.

    2) dig domain.com mx

    ; <<>> DiG 9.3.2-P2.3 <<>> domain.com mx
    ;; global options: printcmd
    ;; Got answer:
    ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 39944
    ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 3, ADDITIONAL: 4

    ;; QUESTION SECTION:
    ;domain.com. IN MX

    ;; ANSWER SECTION:
    domain.com. 75585 IN MX 10 dddd.domain.com.

    ;; AUTHORITY SECTION:
    domain.com. 53332 IN NS ns3.do.domain.net.
    domain.com. 53332 IN NS ns2.domain.de.
    domain.com. 53332 IN NS ns1.do.domain.net.

    ;; ADDITIONAL SECTION:
    dddd.domain.com. 36520 IN A xx.xxx.xxx.25
    ns1.do.domain.net. 14691 IN A xx.xxx.xxx.31
    ns2.domain.de. 14691 IN A xx.xxx.xx.31
    ns3.do.domain.net. 14691 IN A xx.xx.xxx.53

    ;; Query time: 0 msec
    ;; SERVER: 10.x.x.53#53(10.x.x.53)
    ;; WHEN: Thu May 26 13:10:09 2011
    ;; MSG SIZE rcvd: 189


    3) dig domain.com any

    ; <<>> DiG 9.3.2-P2.3 <<>> domain.com any
    ;; global options: printcmd
    ;; Got answer:
    ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 33316
    ;; flags: qr rd ra; QUERY: 1, ANSWER: 6, AUTHORITY: 3, ADDITIONAL: 4

    ;; QUESTION SECTION:
    ;domain.com. IN ANY

    ;; ANSWER SECTION:
    domain.com. 75383 IN MX 10 dddd.domain.com.
    domain.com. 9058 IN TXT "v=spf1 ip4:xx.xxx.xxx.202 a:zimbra.domain.com ip4:xx.xxx.xxx.212 a:maildo.domain.com

    ip4:xx.xxx.xxx.25 a:ddd.domain.com a:smtp.do.domain.com -all"
    domain.com. 4889 IN A xx.xxx.xx.13
    domain.com. 53130 IN NS ns2.domain.de.
    domain.com. 53130 IN NS ns3.do.domain.net.
    domain.com. 53130 IN NS ns1.do.domain.net.

    ;; AUTHORITY SECTION:
    domain.com. 53130 IN NS ns3.do.domain.net.
    domain.com. 53130 IN NS ns1.do.domain.net.
    domain.com. 53130 IN NS ns2.domain.de.

    ;; ADDITIONAL SECTION:
    dddd.domain.com. 36318 IN A xx.xxx.xxx.25
    ns1.do.domain.net. 14489 IN A xx.xxx.xxx.31
    ns2.domain.de. 14489 IN A xx.xxx.xx.31
    ns3.do.domain.net. 14489 IN A xx.xxx.xxx.53

    ;; Query time: 0 msec
    ;; SERVER: 10.x.x.53#53(10.x.x.53)
    ;; WHEN: Thu May 26 13:13:31 2011
    ;; MSG SIZE rcvd: 406

    4) cat /etc/resolv.conf
    domain domain.com
    search domain.com

    nameserver 10.x.x.53
    nameserver 10.x.x.14
    nameserver 10.x.x.15
    nameserver 10.x.x.16


    cat /etc/hosts
    127.0.0.1 localhost.localdomain localhost
    78.xxx.xxx.202 zimbra.domain.com zimbra


    # The following lines are desirable for IPv6 capable hosts
    ::1 ip6-localhost ip6-loopback
    fe00::0 ip6-localnet
    ff00::0 ip6-mcastprefix
    ff02::1 ip6-allnodes
    ff02::2 ip6-allrouters
    ff02::3 ip6-allhosts

    ***
    Last edited by errolu; 05-26-2011 at 06:18 AM.

  4. #4
    phoenix is offline Zimbra Consultant & Moderator
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    Quote Originally Posted by errolu View Post
    1)
    Code:
     host $(hostname)
    zimbra.domain.com has address xx.xx.xx.202
    zimbra.domain.com mail is handled by 40 dddd.domain.com.
    Code:
    dig domain.com any
    
    ; <<>> DiG 9.3.2-P2.3 <<>> domain.com any
    ;; global options:  printcmd
    ;; Got answer:
    ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 33316
    ;; flags: qr rd ra; QUERY: 1, ANSWER: 6, AUTHORITY: 3, ADDITIONAL: 4
    
    ;; QUESTION SECTION:
    ;domain.com.                    IN      ANY
    
    ;; ANSWER SECTION:
    domain.com.             75383   IN      MX      10 dddd.domain.com.
    domain.com.             9058    IN      TXT     "v=spf1 ip4:xx.xxx.xxx.202 a:zimbra.domain.com ip4:xx.xxx.xxx.212 a:maildo.domain.com 
    
    ip4:xx.xxx.xxx.25 a:ddd.domain.com a:smtp.do.domain.com -all"
    domain.com.             4889    IN      A       xx.xxx.xx.13
    domain.com.             53130   IN      NS      ns2.domain.de.
    domain.com.             53130   IN      NS      ns3.do.domain.net.
    domain.com.             53130   IN      NS      ns1.do.domain.net.
    
    ;; AUTHORITY SECTION:
    domain.com.             53130   IN      NS      ns3.do.domain.net.
    domain.com.             53130   IN      NS      ns1.do.domain.net.
    domain.com.             53130   IN      NS      ns2.domain.de.
    
    ;; ADDITIONAL SECTION:
    dddd.domain.com.        36318   IN      A       xx.xxx.xxx.25
    ns1.do.domain.net.      14489   IN      A       xx.xxx.xxx.31
    ns2.domain.de.          14489   IN      A       xx.xxx.xx.31
    ns3.do.domain.net.      14489   IN      A       xx.xxx.xxx.53
    
    ;; Query time: 0 msec
    ;; SERVER: 10.x.x.53#53(10.x.x.53)
    ;; WHEN: Thu May 26 13:13:31 2011
    ;; MSG SIZE  rcvd: 406
    [CODE]
    Code:
    cat /etc/hosts
    127.0.0.1 	localhost.localdomain localhost
    78.xxx.xxx.202 	zimbra.domain.com zimbra
    The highlighted ones are the IP address I'm talking about.
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

  5. #5
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    Default new input...

    Hi Bill,

    thanks again for taking the time to look over my conf.

    I think that the assigned/configured IP's are ok & that we are good on that side - As mentioned the dddd.domain.com handles the mail for zimbra.domain.com and there is also an entry in the DNS for this constellation (please see below).

    The e-mail send/receive works ok for approx 99,+% of the mail traffic, but quite often (a few times day/week) we get these glitches where there is a string appended to the domain-name part of the recipients and thus causing DNS errors (hoist not found, etc.) - Also, I have now feedback that this happens most of the time in cases where appointments are getting re-scheduled in/via the zimbra-calendar feature - This happens with Outlook & Thunderbird users.

    -sinp-
    dig zimbra.domain.com mx

    ; <<>> DiG 9.3.2-P2.3 <<>> zimbra.domain.com mx
    ;; global options: printcmd
    ;; Got answer:
    ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 57024
    ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 3, ADDITIONAL: 4

    ;; QUESTION SECTION:
    ;zimbra.domain.com. IN MX

    ;; ANSWER SECTION:
    zimbra.domain.com. 86400 IN MX 40 dddd.domain.com.
    -snip-

    cheers,
    Errol

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