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  1. #1
    Join Date
    Jan 2006
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    663

    * rdns setup taking ages

    Hi,

    Can anyone advise me, I have requested rdns to be set up 6 days ago but the rdns isnt done yet, im getting confused as they say I have to keep waiting due to other isp

    Ive checked from my server using host comand

    root@uk7 [~]# host x.x.x.x
    Host x.x.x.x.in-addr.arpa. not found: 3(NXDOMAIN)
    and nslookup

    root@uk7 [~]# nslookup x.x.x.x
    Server: x.x.x.x
    Address: x.x.x.x#53
    ** server can't find x.x.x.x.in-addr.arpa.: NXDOMAIN
    I really need to get this sorted as wasting money as I need to install domains and email accounts

    Regards

    Keith
    VPS & Dedi with -
    UKServers (8/10) Clouvider (7/10) 12 month, Rapidswitch (1/10) 15Years+, Hivelocity (10/10) 7 Years, Clustered net (10+/10) 17Years+

  2. #2
    Join Date
    Dec 2006
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    4,151
    If your host is not the datacenter but reselling them in some way (maybe they're colocating, etc.) then they may need to fall back on a 3rd party (the datacenter) when getting the RDNS set, which would explain the delay.

    Have you tried pressing them for a reply in the last 2 days?
    Perhaps you can quote their reply here.

  3. #3
    Join Date
    Jan 2006
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    663
    I dont want to affend the host as I not sure on this rdns thing

    they say its all set, but takes time to change due to other isps, normally within 48hrs all should be done

    Im giving it one more day then bailing
    VPS & Dedi with -
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  4. #4
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    Quote Originally Posted by keith007 View Post
    they say its all set, but takes time to change due to other isps, normally within 48hrs all should be done
    Propagation of rDNS changes can take 24-48 hours once they have been made. With that said, it does not usually take that long; but can though.
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  5. #5
    6 days does seem extreme normally 48hrs would be the maximum
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  6. #6
    After your host say they have updated it, confirm it using Check Reverse DNS Lookup at http://www.iptools.com

    If it shows up correctly you just need to wait up to 24 hours for the change to take affect.

    Hope this helps.
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  7. #7
    Join Date
    Dec 2007
    Posts
    1,278
    It might be your nameserver. If you do an nslookup on something and it doesn't exist that result is going to be cached. It's also usually going to cache locally.

    Try using an external nameserver such as 'nslookup ipaddress 4.2.2.2'

    4.2.2.2 is level3's resolver and they don't hold much of a cache.

    It won't work if your on a network that level3 doesn't support however i've yet to see them block anyone.

    If the 4.2.2.2 works for you it's not the rdns at fault.

    And in spite of what's said about 24-48 hours that's simply not correct. Once a nameserver that has authority over something refreshes that's it, it becomes an instant change unless negative caching exists for the item(s).
    Last edited by woods01; 11-06-2010 at 04:09 PM.
    James Paul Woods
    Operations Manager
    HostKitty Internet Services

  8. #8
    Join Date
    Jan 2008
    Location
    Jax, FL
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    2,707
    Run a dig directly against the nameservers that host the in-addr.arpa zones --

    dig -x IP_HERE @nameserver

    See if maybe it is perhaps propagation lag or if it truly is not set.
    Daniel | Server Complete, LLC
    INSTANTLY DEPLOYED Bare Metal Servers
    Wholly owned hardware and self operated network (AS19531) in Jacksonville, FL

  9. #9
    Join Date
    Jan 2006
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    663
    Quote Originally Posted by woods01 View Post
    It might be your nameserver. If you do an nslookup on something and it doesn't exist that result is going to be cached. It's also usually going to cache locally.

    Try using an external nameserver such as 'nslookup ipaddress 4.2.2.2'

    4.2.2.2 is level3's resolver and they don't hold much of a cache.

    It won't work if your on a network that level3 doesn't support however i've yet to see them block anyone.

    If the 4.2.2.2 works for you it's not the rdns at fault.

    And in spite of what's said about 24-48 hours that's simply not correct. Once a nameserver that has authority over something refreshes that's it, it becomes an instant change unless negative caching exists for the item(s).
    Hi,

    Here is the results of nslookup

    root@uk7 [~]# nslookup xx.xx.xx.xx 4.2.2.2
    Server: 4.2.2.2
    Address: 4.2.2.2#53

    Non-authoritative answer:
    xx.xx.xx.xx.in-addr.arpa name = xxx.domain.co.uk.

    Authoritative answers can be found from:
    So with that working what should I do, is there an issue with my nameserver


    cheers

    Keith
    VPS & Dedi with -
    UKServers (8/10) Clouvider (7/10) 12 month, Rapidswitch (1/10) 15Years+, Hivelocity (10/10) 7 Years, Clustered net (10+/10) 17Years+

  10. #10
    Join Date
    Jan 2006
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    Quote Originally Posted by HostXNow View Post
    After your host say they have updated it, confirm it using Check Reverse DNS Lookup at http://www.iptools.com

    If it shows up correctly you just need to wait up to 24 hours for the change to take affect.

    Hope this helps.

    This shows the correct value now

    Cheers

    Keith
    VPS & Dedi with -
    UKServers (8/10) Clouvider (7/10) 12 month, Rapidswitch (1/10) 15Years+, Hivelocity (10/10) 7 Years, Clustered net (10+/10) 17Years+

  11. #11
    Join Date
    Jan 2008
    Location
    Jax, FL
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    Edit your /etc/resolv.conf to contain the following:

    nameserver 4.2.2.1
    nameserver 4.2.2.2
    options rotate
    That will make your server perform all DNS lookups against the Level3 resolvers.
    Daniel | Server Complete, LLC
    INSTANTLY DEPLOYED Bare Metal Servers
    Wholly owned hardware and self operated network (AS19531) in Jacksonville, FL

  12. #12
    Join Date
    Nov 2010
    Posts
    7
    The quickest RDNS Updates i have seen have to instant.
    Thats only with one provider. the rest around 4 hours. some could take days.
    Last edited by Zack-Hancock; 11-06-2010 at 04:57 PM.

  13. #13
    Join Date
    Jan 2006
    Posts
    663
    normally all my other servers dns are within 4 hours atleast,

    I took out another server wednesday and thats all fine with in 1 day, Just puzzles me
    VPS & Dedi with -
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  14. #14
    Join Date
    Dec 2007
    Posts
    1,278
    It depends on the dns configuration that is used. Bind usually needs a refreshment done of the zone file which isn't a big deal however when your dealing with large nameservers you waste alot of resources constantly refreshing them with each ip change. So sometimes they are done every so often.

    djbdns/powerdns and the like usually run off crons that automatically update zones regardless if anything has been changed or not so your always going to have the latest changes published on a schedule.

    If you ever have a doubt just ask your uplink how often the dns updates, if can vary by provider.
    James Paul Woods
    Operations Manager
    HostKitty Internet Services

  15. #15
    Join Date
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    Location
    Seattle, WA
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    Quote Originally Posted by SC-Daniel View Post
    Edit your /etc/resolv.conf to contain the following:



    That will make your server perform all DNS lookups against the Level3 resolvers.
    I don't recommend doing that. Their resolvers are slow and sometimes unavailable - a result of being the resolver of choice for technicians who like easy-to-remember numbers. :-)
    Seattle, WA - Gigabit Carrier & Network Services Provider
    Uptime | Atlas Networks

  16. #16
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    Quote Originally Posted by atlasnetworkseric View Post
    a result of being the resolver of choice for technicians who like easy-to-remember numbers. :-)
    Googles is the easiet to remember... One number straight across.
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  17. #17
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    I would put an average on 48 hours max unless you've put it through on a weekend or public holiday. Most ISP's don't have an active response over weekends unless for emergencies.

  18. #18
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    Quote Originally Posted by atlasnetworkseric View Post
    I don't recommend doing that. Their resolvers are slow and sometimes unavailable - a result of being the resolver of choice for technicians who like easy-to-remember numbers. :-)
    Well we use Google public DNS and haven't found any issue with them.

    nameserver 8.8.8.8
    nameserver 8.8.4.4
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  19. #19
    Quote Originally Posted by keith007 View Post
    This shows the correct value now

    Cheers

    Keith
    No problem at all.
    HostXNow - Shared Web Hosting | Semi Dedicated Hosting | Enterprise Reseller Hosting | VPS Hosting

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