free network analyzer?

Discussion in 'other software & services' started by Slovak, Mar 3, 2008.

Thread Status:
Not open for further replies.
  1. Slovak

    Slovak Registered Member

    Joined:
    Mar 4, 2004
    Posts:
    515
    Location:
    Medina, Ohio
    Are there any good free ones to help me find nat issues on my network? I keep having a problem accessing a few popular web sites, like aol.com, yahoo.com, etc. I have tried various routers, and my isp has tried various modems too and the problem still happens, but not when I bypass any router I have. The techs determined that there is an issue somewhere within my small 3 computer network causing a nat conflict. How do I find this problem?
     
  2. thanatos_theos

    thanatos_theos Registered Member

    Joined:
    Apr 28, 2007
    Posts:
    540
    Try WireShark (free) or Capsa (paid). Capsa's support forum is near :D. Let's also wait for Stem and the others to step in.

    thanatos
     
  3. GlobalForce

    GlobalForce Regular Poster

    Joined:
    Jun 30, 2004
    Posts:
    3,581
    Location:
    Garden State, USA
    You begin by putting up more information; system's involved, individual mtu value's, router make/model, etc ....
    These two, pccitizen.com and tech-faq.com might help expose an area that's been previously overlooked.

    GF
     
    Last edited: Mar 3, 2008
  4. HAN

    HAN Registered Member

    Joined:
    Feb 24, 2005
    Posts:
    2,080
    Location:
    USA
    Since you only have 3 PCs (and I assume, a small number of any other networked hardware, like printers etc.) have you tried hard coding the IP Addresses for everything, rather than let them be assigned by DHCP? Seems like it might help prevent any address conflicts...
     
  5. ThunderZ

    ThunderZ Registered Member

    Joined:
    May 1, 2006
    Posts:
    2,459
    Location:
    North central Ohio, U.S.A.

    Assigning static IPs can solve many a problem. Did for myself and a Friend on our 8+ PC mixed wired\wireless network. As stated, a bit more info. would be helpful.
     
  6. Slovak

    Slovak Registered Member

    Joined:
    Mar 4, 2004
    Posts:
    515
    Location:
    Medina, Ohio
    The systems involved are one winxp pro and 2 winxp home computers. Two custom built, and one xp home is a dell. The mtu's are standard for cable, 1500 on all computers. The router is a D-Link DGL-4500, all computers are wired
     
  7. Slovak

    Slovak Registered Member

    Joined:
    Mar 4, 2004
    Posts:
    515
    Location:
    Medina, Ohio
    How do I hard code the ip addresses and assign static ip's?
     
  8. lucas1985

    lucas1985 Retired Moderator

    Joined:
    Nov 9, 2006
    Posts:
    4,047
    Location:
    France, May 1968
    You need to disable the DHCP server in your router and manually write the IPs on each machine (My Network Places > Properties > TCP/IP > Properties)
     
  9. ellison64

    ellison64 Registered Member

    Joined:
    Oct 5, 2003
    Posts:
    2,499
    Could it be possible that your ISP uses lower mtu setting than the standard 1500 cable?Your symptoms sound very much like what happened to a friend of mine who was on orange broadband(although it was dsl pppoa...not cable).His mtu was 1500 and he could access some sites but not all.It turned out that the ISP uses 1430 ,although he wasn't told that over the phone.Maybe worth just lowering the mtu to make sure?

    ellison
     
  10. Slovak

    Slovak Registered Member

    Joined:
    Mar 4, 2004
    Posts:
    515
    Location:
    Medina, Ohio
    They use 1500 for sure, had a tech here and he was helpful.
     
  11. ellison64

    ellison64 Registered Member

    Joined:
    Oct 5, 2003
    Posts:
    2,499
    Sounds like your on a decent ISP :)
    As well as the packet sniffer suggestions you may want to try visualroute (lite is the free) or trial.I found it pretty useful in the past for locating problems.It does need java enabled to function though.
    http://www.visualroute.com/lite.html
    ellison
     
  12. HAN

    HAN Registered Member

    Joined:
    Feb 24, 2005
    Posts:
    2,080
    Location:
    USA

    Attached Files:

    Last edited: Mar 4, 2008
Loading...
Thread Status:
Not open for further replies.