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  1. #201
    Service Manager 1,000+ Posts
    Need some advice on learning networking

    BillyCarpenter's Avatar
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    Re: Need some advice on learning networking

    Quote Originally Posted by bsm2 View Post
    The only way it can resolve a hostname is through DNS not DHCP.

    So, I'm correct that pinging the hostname of the copier only proves that DNS is working? It does not prove that DHCP is working?

  2. #202
    IT Manager 5,000+ Posts bsm2's Avatar
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    Re: Need some advice on learning networking

    Quote Originally Posted by BillyCarpenter View Post
    So, I'm correct that pinging the hostname of the copier only proves that DNS is working? It does not prove that DHCP is working?
    Yes if DHCP is not working you could run an ipconfig and the the pc address would 169. something same as if you connect a copier with DHCP address would be 169. something.

    You would have no internet no printing etc.......

  3. #203
    Service Manager 1,000+ Posts
    Need some advice on learning networking

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    Re: Need some advice on learning networking

    Quote Originally Posted by bsm2 View Post
    The only way it can resolve a hostname is through DNS not DHCP.
    the things that happen when a man is sleepy... well you guys get the idea... the point being... you can tell if the host name is connecting to the ip address... or not...

    and yes its dns not dhcp... my appologies for mixing my terms...

    also yep... if you get a 169.xxx.xxx.xxx address that usually means dhcp is down...
    sorry about that...
    just got up...
    and reread my junk...

    made the correction in the original post...
    let me know if all is well...
    I am never a man averse to learning or correction...
    Sad To Say I Don't Have a Life
    I do this stuff on the weekends too

  4. #204
    Service Manager 1,000+ Posts
    Need some advice on learning networking

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    Re: Need some advice on learning networking

    Quote Originally Posted by BillyCarpenter View Post
    I pinged the host name of the copier and it did respond like you said, but I'm unsure how this proves that DHCP is working. I understand how it proves DNS is working but not DHCP. Can you explain further? Thanks.
    my thinking was if you can't pull the dhcp server up using ipconfig in the way instructed above from the command line... or even ping it... then its probably down...

    atleast that was my thought...

    its a roundabout way of doing it...
    but that was my thinking...
    Sad To Say I Don't Have a Life
    I do this stuff on the weekends too

  5. #205
    Service Manager 1,000+ Posts
    Need some advice on learning networking

    BillyCarpenter's Avatar
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    Re: Need some advice on learning networking

    Quote Originally Posted by n25an View Post
    my thinking was if you can't pull the dhcp server up using ipconfig in the way instructed above from the command line... or even ping it... then its probably down...

    atleast that was my thought...

    its a roundabout way of doing it...
    but that was my thinking...
    Don't worry about it. You, along with others, have taught me so much. A few weeks ago I wouldn't have even caught that mistake. This is no longer about only networking a copier for me. I want to know much more and I want to know how to troubleshoot DHCP and DNS. At the heart of IT it's about solving problems and you have to have a deep understanding of this stuff to find and correct the problem. Right?

  6. #206
    IT Manager 5,000+ Posts bsm2's Avatar
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    Re: Need some advice on learning networking

    Quote Originally Posted by BillyCarpenter View Post
    Don't worry about it. You, along with others, have taught me so much. A few weeks ago I wouldn't have even caught that mistake. This is no longer about only networking a copier for me. I want to know much more and I want to know how to troubleshoot DHCP and DNS. At the heart of IT it's about solving problems and you have to have a deep understanding of this stuff to find and correct the problem. Right?

    Ping is your friend
    ping the copier
    ping the gateway
    ping google.com

    Now some network works are locked down IE enterprise where IT will give you and address you can't ping it but it works.

  7. #207
    Service Manager 1,000+ Posts
    Need some advice on learning networking

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    Re: Need some advice on learning networking

    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?

  8. #208
    IT Manager 5,000+ Posts bsm2's Avatar
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    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?
    Unplug the copier and if you get a ping Bingo

  9. #209
    Service Manager 1,000+ Posts
    Need some advice on learning networking

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    Re: Need some advice on learning networking

    Quote Originally Posted by bsm2 View Post
    Unplug the copier and if you get a ping Bingo
    Duh. Now I'm feeling really dumb. lol

  10. #210
    Service Manager 2,500+ Posts tsbservice's Avatar
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    Re: Need some advice on learning networking

    Quote Originally Posted by bsm2 View Post
    Unplug the copier and if you get a ping Bingo
    Yepp, that's the way
    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.

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