Page 22 of 53 FirstFirst ... 121314151617181920212223242526272829303132 ... LastLast
Results 211 to 220 of 528
  1. #211
    Service Manager 2,500+ Posts tsbservice's Avatar
    Join Date
    May 2007
    Posts
    3,332
    Rep Power
    151

    Re: Need some advice on learning networking

    Quote Originally Posted by BillyCarpenter View Post
    Duh. Now I'm feeling really dumb. lol
    Billy you're definitely NOT dumb, it's impossible for anyone to know everything
    A tree is known by its fruit, a man by his deeds. A good deed is never lost, he who sows courtesy, reaps friendship, and he who plants kindness gathers love.

    Blessed are they who can laugh at themselves, for they shall never cease to be amused.

  2. #212
    Service Manager 1,000+ Posts
    Need some advice on learning networking

    n25an's Avatar
    Join Date
    Jul 2008
    Location
    miami, florida
    Posts
    1,008
    Rep Power
    40

    Re: Need some advice on learning networking

    Quote Originally Posted by BillyCarpenter View Post
    Here's a question for the IT experts on here:

    Lets say I suspect that a virus (or something else) is assigning rouge IP address and I want to find out if there's a duplicate IP address. What's the best way to see if there's a duplicate IP address. I know one way is to use a scan tool. I used NetScan Tools Pro and ran an ARP request for the copier IP address. It sent out an ARP request and showed every MAC addresses that's on that IP address. So that's one way. But that's an invasive method and I would need to get permission to run something like that on a customer's network.

    Are there any less invasive ways to do this?
    yep I thought of the unplug copier thing too... but I got the feeling he was going deeper...
    I did a quick search on virus that redirect ip addresseses that led me to dns hijacking as a search term which led me to
    DNS hijacks: what to look for - Malwarebytes Labs | Malwarebytes Labs
    that article gives an excellent explanation of how it can be accomplished by the virus editing your hostfile and editing your dns entries on your nic... and it goes into other methods as well.. such as router attacks and forced govt internet censorship...

    related search terms
    dns cache poisoning
    dns cache spoofing

    at that point you are getting into
    white hack ethical hacking and penetration testing...
    if you are interested in that stuff... then grab a free copy of kali and install it on a thumb drive you are not using and boot into it from time to time and familiarize yourself... but I warn you that is a field all by itself... so you could be there for a long time...
    Sad To Say I Don't Have a Life
    I do this stuff on the weekends too

  3. #213
    Service Manager 2,500+ Posts
    Need some advice on learning networking

    BillyCarpenter's Avatar
    Join Date
    Aug 2020
    Location
    Long Beach, Mississippi
    Posts
    2,643
    Rep Power
    92

    Re: Need some advice on learning networking

    Quote Originally Posted by n25an View Post
    yep I thought of the unplug copier thing too... but I got the feeling he was going deeper...
    I did a quick search on virus that redirect ip addresseses that led me to dns hijacking as a search term which led me to
    DNS hijacks: what to look for - Malwarebytes Labs | Malwarebytes Labs
    that article gives an excellent explanation of how it can be accomplished by the virus editing your hostfile and editing your dns entries on your nic... and it goes into other methods as well.. such as router attacks and forced govt internet censorship...

    related search terms
    dns cache poisoning
    dns cache spoofing

    at that point you are getting into
    white hack ethical hacking and penetration testing...
    if you are interested in that stuff... then grab a free copy of kali and install it on a thumb drive you are not using and boot into it from time to time and familiarize yourself... but I warn you that is a field all by itself... so you could be there for a long time...
    I was going deeper than that, I just used a bad example. Let me try again.

    Lets say some rouge agent is handing out duplicate addresses. I want to find all devices on the same IP address and I want to find the source that's handing out the rouge IP addresses. What's the best way to do that?

  4. #214
    Geek Extraordinaire 2,500+ Posts KenB's Avatar
    Join Date
    Dec 2007
    Location
    Cleveland, Ohio
    Posts
    3,365
    Rep Power
    94

    Re: Need some advice on learning networking

    Quote Originally Posted by bsm2 View Post
    Unplug the copier and if you get a ping Bingo
    Always a good idea to run "ipconfig /flushdns" first, before pinging the address. It's possible (however unlikely) to get a false response otherwise.
    Some days youíre the dog, some days youíre the fire hydrant.

  5. #215
    Geek Extraordinaire 2,500+ Posts KenB's Avatar
    Join Date
    Dec 2007
    Location
    Cleveland, Ohio
    Posts
    3,365
    Rep Power
    94

    Re: Need some advice on learning networking

    Quote Originally Posted by BillyCarpenter View Post
    I was going deeper than that, I just used a bad example. Let me try again.

    Lets say some rouge agent is handing out duplicate addresses. I want to find all devices on the same IP address and I want to find the source that's handing out the rouge IP addresses. What's the best way to do that?
    Google is your friend. I found this with one simple search:

    networking - How do I find if there is a rogue DHCP server on my Network? - Server Fault
    Some days youíre the dog, some days youíre the fire hydrant.

  6. #216
    Service Manager 2,500+ Posts
    Need some advice on learning networking

    BillyCarpenter's Avatar
    Join Date
    Aug 2020
    Location
    Long Beach, Mississippi
    Posts
    2,643
    Rep Power
    92

    Re: Need some advice on learning networking

    Quote Originally Posted by KenB View Post
    Google is your friend. I found this with one simple search:

    networking - How do I find if there is a rogue DHCP server on my Network? - Server Fault

    I did google it before I asked. There were a wide range of suggestions, I'm just not experienced enough to know the best option. Now, in the link you posted, I did read one method that I hadn't read. And that is to disable to primary DHCP server and see if I get response back from somewhere else. So, thanks for the link.

  7. #217
    Geek Extraordinaire 2,500+ Posts KenB's Avatar
    Join Date
    Dec 2007
    Location
    Cleveland, Ohio
    Posts
    3,365
    Rep Power
    94

    Re: Need some advice on learning networking

    Quote Originally Posted by BillyCarpenter View Post
    I did google it before I asked. There were a wide range of suggestions, I'm just not experienced enough to know the best option. Now, in the link you posted, I did read one method that I hadn't read. And that is to disable to primary DHCP server and see if I get response back from somewhere else. So, thanks for the link.
    You're welcome.

    I think the best option would highly depend on what the customer's IT is willing to do, or let you do.

    Not a "one size fits all" solution.
    Some days youíre the dog, some days youíre the fire hydrant.

  8. #218
    Service Manager 2,500+ Posts
    Need some advice on learning networking

    BillyCarpenter's Avatar
    Join Date
    Aug 2020
    Location
    Long Beach, Mississippi
    Posts
    2,643
    Rep Power
    92

    Re: Need some advice on learning networking

    Quote Originally Posted by KenB View Post
    You're welcome.

    I think the best option would highly depend on what the customer's IT is willing to do, or let you do.

    Not a "one size fits all" solution.

    Point taken, my man. lol

    I know I'm going well beyond what I'd normally encounter, but I just can't seem to help myself.

  9. #219
    Retired 10,000+ Posts slimslob's Avatar
    Join Date
    May 2013
    Location
    Bakersfield, CA
    Posts
    13,310
    Rep Power
    340

    Re: Need some advice on learning networking

    Quote Originally Posted by KenB View Post
    Keep in mind that back then most color printing was coming from Mac workstations, and they would usually use AppleTalk, so IP printing was fairly rare. Micro$oft didnít include IP printing in Windows 3.x, 95, or 98, only in NT. There was software to add AppleTalk, such as PC MacLAN and COPSTalk. NT supported AppleTalk natively.
    For any Windows OS version the included the net command there was always net use lpt1 \printserver\printer where printserver is the IP address of the printer and printer is the hostname of the print device. It could be put in a batch file used to launch a program or even in the autoexec.bat file.

  10. #220
    Service Manager 1,000+ Posts
    Need some advice on learning networking

    skynet's Avatar
    Join Date
    Apr 2009
    Location
    127.0.0.1
    Posts
    1,852
    Rep Power
    101

    Re: Need some advice on learning networking

    Quote Originally Posted by BillyCarpenter View Post
    I was going deeper than that, I just used a bad example. Let me try again.

    Lets say some rouge agent is handing out duplicate addresses. I want to find all devices on the same IP address and I want to find the source that's handing out the rouge IP addresses. What's the best way to do that?
    err its been said before install wireshark if you have permission
    When you think you have made a procedure idiot proof your company employs a better idiot.

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Get the Android App
click or scan for the Copytechnet Mobile App

-= -= -= -= -=


IDrive Remote Backup

Lunarpages Internet Solutions

Advertise on Copytechnet

Your Link Here