+ Post New Thread
Results 1 to 8 of 8
Windows Thread, Serious help needed! in Technical; OK this is very weird. We got in today and our Cisco 2600 router was constantly flashing on activity. No ...
  1. #1

    MK-2's Avatar
    Join Date
    Oct 2006
    Location
    Nottingham
    Posts
    3,237
    Thank Post
    149
    Thanked 581 Times in 307 Posts
    Blog Entries
    8
    Rep Power
    199

    Serious help needed!

    OK this is very weird.
    We got in today and our Cisco 2600 router was constantly flashing on activity. No network access, and after restarting the switches, router and servers we found that our DHCP and DNS server had gone t*ts up. DHCP and DNS had disappeared off the server. If I go to manage server, its listed as not configured, yet yesterday it was all working.
    EMBC say they can ping our router fine, yet internall I get a reply followed by "destination net unreachable"
    right now we have the router, one server (now with no dhcp/dns) and my machine with no network access (i can access my machine via remote admin but no http via port 80 normally).
    Any help would be VERY much appreciated!

  2. #2

    MK-2's Avatar
    Join Date
    Oct 2006
    Location
    Nottingham
    Posts
    3,237
    Thank Post
    149
    Thanked 581 Times in 307 Posts
    Blog Entries
    8
    Rep Power
    199

    Re: Serious help needed!

    OK an update:

    just checked on the server, at 1:15pm yesterday in event log it shows the DNS server was shutdown (not by us). But now its not even showing as being installed. I think if I can get DHCP/DNS working again (I don't want to just reinstall/reconfigure them without knowing why they disappeared in the first place) then the internet will work again

  3. #3
    Joedetic's Avatar
    Join Date
    Jan 2006
    Location
    Walsall
    Posts
    1,316
    Thank Post
    6
    Thanked 13 Times in 13 Posts
    Rep Power
    22

    Re: Serious help needed!

    Are the EMBC pinging the WAN side IP Address (IE there side...maybe on a WIC card?) or the internal ethernet port?

    Also...if the DHCP has gone t*ts up what default gateway is being asigned?...and that's only if machines are picking up a lease from the server.

    Have you tried plugging a laptop directly into these machines via a crossover cable to see if you can get any connectivity using a statically set IP on the laptop?

    The dhcp and dns issues....could they be update issues? If you have a linux machine available try nmap <IP ADDRESS OF SERVER> to see what services are running.

    I dont know if that helps or not but they are a few things i'd try.

  4. #4

    MK-2's Avatar
    Join Date
    Oct 2006
    Location
    Nottingham
    Posts
    3,237
    Thank Post
    149
    Thanked 581 Times in 307 Posts
    Blog Entries
    8
    Rep Power
    199

    Re: Serious help needed!

    i have a static ip on my machine, and the gateway is set to the cisco router. but no webpages load. i'm not too concerned about the internet just yet, its more why dhcp/dns just disappeared totally.

    it might be an update issue, but things are running so slow right now its taking ages to check anything.
    will keep looking, cheers for the help

  5. #5
    Joedetic's Avatar
    Join Date
    Jan 2006
    Location
    Walsall
    Posts
    1,316
    Thank Post
    6
    Thanked 13 Times in 13 Posts
    Rep Power
    22

    Re: Serious help needed!

    What if you try the opendns DNS servers just to check the internet.

    Primary = 208.67.222.222
    Secondary = 208.67.220.220

    But yes...it does sound a bit suspect. How secure's your admin pass? :P

  6. #6

    Join Date
    Jul 2007
    Posts
    33
    Thank Post
    16
    Thanked 2 Times in 2 Posts
    Rep Power
    15

    Re: Serious help needed!

    Have seem that type of error before.. Normal cause by a fault nic or blown port on switch\Route. When the DNS & DHCP on a windows server gets lots of error it cause them to crash & are unable to restart, until you clear out the DHCP, DNS Databases manual.

    First thing you need to know is what is causing the problem.. only way is to check each item in turn with everything else unplugged. i.e. Check server nic with laptop\desktop pc with crossover cable. See if you can talk to each over it. Then when you know the server works ok attach it to the route with nothing else attached and try to talk to it.. Take quite a long time to check though everything, but it the only way

    Hope this helps

    Ste

  7. #7

    Geoff's Avatar
    Join Date
    Jun 2005
    Location
    Fylde, Lancs, UK.
    Posts
    11,802
    Thank Post
    110
    Thanked 583 Times in 504 Posts
    Blog Entries
    1
    Rep Power
    224

    Re: Serious help needed!

    I know it's a bit late now, but you might want to install some monitoring software such as Nagios to help you track down problems faster (it'll even tell you about broken things before anyone realised it's broken).

  8. #8

    MK-2's Avatar
    Join Date
    Oct 2006
    Location
    Nottingham
    Posts
    3,237
    Thank Post
    149
    Thanked 581 Times in 307 Posts
    Blog Entries
    8
    Rep Power
    199

    Re: Serious help needed!

    Geoff, thanks for the heads up. It's been sorted now, still no idea of a cause but at least we have DHCP and DNS back up. Likely cause was something from Windows update but no proof.

    And just to add to matters, we've found that one of our servers has a bad disk in it's array. So there goes another purchase order

    I'll look into the software you mentioned for the future, thanks

SHARE:
+ Post New Thread

Similar Threads

  1. Mac experts help needed
    By Rozzer in forum Mac
    Replies: 4
    Last Post: 3rd August 2007, 08:08 AM
  2. Needed...
    By russdev in forum General EduGeek News/Announcements
    Replies: 0
    Last Post: 30th July 2007, 10:11 PM
  3. RAM help needed!
    By richbeck2 in forum Hardware
    Replies: 5
    Last Post: 18th July 2007, 06:53 PM
  4. GUI and some help needed
    By MK-2 in forum Windows
    Replies: 4
    Last Post: 1st March 2007, 05:18 PM
  5. advice needed on weather a new server is needed
    By projector1 in forum Hardware
    Replies: 3
    Last Post: 24th February 2006, 09:20 AM

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •