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  1. #191
    Service Manager 2,500+ Posts
    Need some advice on learning networking

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    Re: Need some advice on learning networking

    Quote Originally Posted by slimslob View Post
    A couple of problems. If for some reason the subnet get changed, the IP address you enter into the host file may no longer be valid. If the target device is on DHCP it will have been changed or the computer and the target device may no longer be within the same subnet mask range.

    An entry in the host or hosts file depending on OS actually takes precedence over DNS results. If an entry is found in the hosts file your browser goes directly to that address. It can be used to resolve frequently used web pages more quickly. More frequently it is used to block unwanted websites. Example 127.0.0.1 known.unwanted.site will block that site. Instead your browser will connect to the blank local host 127.0.0.1 By blocking certain adware sites can actually speed up the loading of many websites and unlike ad blockers is totally invisible to the website you are loading. How To Block Websites On Windows Using The Hosts File
    Slim,

    You do know your shit. I'm impressed. Thanks for that information. Now I REALLY know how it works. Thank you, brother.

  2. #192
    IT Manager 5,000+ Posts bsm2's Avatar
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    Re: Need some advice on learning networking

    Printing by hostname is very very Rare only had one account in thousands of installs at one college.

    Best practice ia via ipaddress.

    You may wish to be careful as some advise here is from non IT Tech's.

  3. #193
    Service Manager 2,500+ 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
    Printing by hostname is very very Rare only had one account in thousands of installs

    Best practice ia via ipaddress.
    I hear ya, but we want to know all of our options, right?

    I even found this bit of information on the Ricoh site about using host files to resolve the printer host name to the IP address.


    resolove hostname 2.JPG


    Edit: I'm not planning to run out and print to host. Nope. I just want to know how to do it if there's ever a need. And I want to know EVERYthing about it. Or as much as possible. Like I said earlier, I've never gotten in trouble for knowing too much.

    Keep this is mind, also. I'm new to all of this so everything new excites me. You'll have to overlook me. lol
    Last edited by BillyCarpenter; 11-27-2020 at 12:19 AM.

  4. #194
    Retired 10,000+ Posts slimslob's Avatar
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    Re: Need some advice on learning networking

    Quote Originally Posted by BillyCarpenter View Post
    I hear ya, but we want to know all of our options, right?

    I even found this bit of information on the Ricoh site about using host files to resolve the printer host name to the IP address.


    resolove hostname 2.JPG
    I actually learned how to use it at a Ricoh instructor led training class on the martini series.

  5. #195
    Geek Extraordinaire 2,500+ Posts KenB's Avatar
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    Re: Need some advice on learning networking

    This goes waaaaay back.

    Anyone remember the old color Colorbus Cyclone RIPs?

    They were UNIX based (technically Irix) and required an entry in the RIP’s host file of the sending workstation to accept print jobs when printing over IP.

    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 didn’t 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.

    I also recall needing to put an entry in the host table of Windows machines for the early Fiery utilities, such as Downloader and Calibrator. I think that went away with Command Workstation.
    Some days you’re the dog, some days you’re the fire hydrant.

  6. #196
    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 slimslob View Post
    A couple of problems. If for some reason the subnet get changed, the IP address you enter into the host file may no longer be valid. If the target device is on DHCP it will have been changed or the computer and the target device may no longer be within the same subnet mask range.

    An entry in the host or hosts file depending on OS actually takes precedence over DNS results. If an entry is found in the hosts file your browser goes directly to that address. It can be used to resolve frequently used web pages more quickly. More frequently it is used to block unwanted websites. Example 127.0.0.1 known.unwanted.site will block that site. Instead your browser will connect to the blank local host 127.0.0.1 By blocking certain adware sites can actually speed up the loading of many websites and unlike ad blockers is totally invisible to the website you are loading. How To Block Websites On Windows Using The Hosts File
    this explains how some viruses and malware can redirect traffic away from malware removal resources online... interesting... all IT knowledge intersects sooner or later...

    that being said... 15 years in the field... never seen or heard of it before... I have heard of netbios name issues once in 15 years... but thats about it...

    doesn't mean it does not occur... just never had any issues with it...

    good info to know though
    Sad To Say I Don't Have a Life
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  7. #197
    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 slimslob View Post
    The only real problem I ever really had with DHCP was when the DHCP function on a server shut itself down over night. Things that were on fixed IP addresses or had been on all night worked fine. Computers that had been shut off over night could not access the internet or any of the servers or printers. I got called out because in the stock yard office some people could not print. I took me all of 5 minutes to determine that DHCP wasn't working. I called the receptionist and asked her to have their IT call me. She called me back and told me the IT was too busy trying to determine which router was down. 5 minutes their IT supervisor in Seattle called me, the receptionist had called him when the local IT wouldn't take time to talk to me. I told him the problem and 10 minutes later the DHCP was back up.
    correction... if dhcp is down just do an ipconfig from command line and see if you get a 169.xxx.xxx.xxx address if you do its down... thanks for the correction all...

    and below is some command prompt wizardry to check if dns and dhcp servers are up...


    to check if dns is working is to ping host name of copier from command line in windows... if all things are connected and settings are good you should get a response... and it should respond with the ip address if it responds with the gibberish thats ipv6 you can force it to do ipv4

    below is an example with google.com

    ping google.com

    Pinging google.com [2607:f8b0:4000:801::200e] with 32 b
    Reply from 2607:f8b0:4000:801::200e: time=34ms
    Reply from 2607:f8b0:4000:801::200e: time=34ms
    Reply from 2607:f8b0:4000:801::200e: time=34ms
    Reply from 2607:f8b0:4000:801::200e: time=34ms

    Ping statistics for 2607:f8b0:4000:801::200e:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss)
    Approximate round trip times in milli-seconds:
    Minimum = 34ms, Maximum = 34ms, Average = 34ms

    ping google.com -4

    Pinging google.com [172.217.2.238] with 32 bytes of dat
    Reply from 172.217.2.238: bytes=32 time=55ms TTL=112
    Reply from 172.217.2.238: bytes=32 time=37ms TTL=112
    Reply from 172.217.2.238: bytes=32 time=36ms TTL=112
    Reply from 172.217.2.238: bytes=32 time=37ms TTL=112

    Ping statistics for 172.217.2.238:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss)
    Approximate round trip times in milli-seconds:
    Minimum = 36ms, Maximum = 55ms, Average = 41ms


    How to find dhcp server from command prompt in windows...

    ipconfig /all | find /i "DHCP Server"
    DHCP Server . . . . . . . . . . . : 192.168.1.254

    How to check from command prompt that dhcp server is working

    ping 192.168.1.254

    Pinging 192.168.1.254 with 32 bytes of data:
    Reply from 192.168.1.254: bytes=32 time=74ms TTL=64
    Reply from 192.168.1.254: bytes=32 time=6ms TTL=64
    Reply from 192.168.1.254: bytes=32 time=6ms TTL=64
    Reply from 192.168.1.254: bytes=32 time=6ms TTL=64

    Ping statistics for 192.168.1.254:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
    Approximate round trip times in milli-seconds:
    Minimum = 6ms, Maximum = 74ms, Average = 23ms

    How to see what servers are running in windows or at the least are configured for the nic card either automatically or hard wired as a setting

    ipconfig /all | find /i "Server"
    DHCP Server . . . . . . . . . . . : 192.168.1.254
    DNS Servers . . . . . . . . . . . : 192.168.1.254
    Last edited by n25an; 11-27-2020 at 03:57 PM.
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  8. #198
    Service Manager 2,500+ 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
    below is one method... may not be what slimslob used but its valid...
    He probably figured it out from the copier screens...

    never-the-less its listed below...

    a way to check this from command prompt is listed below...

    to check if dhcp is working is to ping host name of copier from command line in windows... if all things are connected and settings are good you should get a response... and it should respond with the ip address if it responds with the gibberish thats ipv6 you can force it to do ipv4

    below is an example with google.com

    ping google.com

    Pinging google.com [2607:f8b0:4000:801::200e] with 32 b
    Reply from 2607:f8b0:4000:801::200e: time=34ms
    Reply from 2607:f8b0:4000:801::200e: time=34ms
    Reply from 2607:f8b0:4000:801::200e: time=34ms
    Reply from 2607:f8b0:4000:801::200e: time=34ms

    Ping statistics for 2607:f8b0:4000:801::200e:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss)
    Approximate round trip times in milli-seconds:
    Minimum = 34ms, Maximum = 34ms, Average = 34ms

    ping google.com -4

    Pinging google.com [172.217.2.238] with 32 bytes of dat
    Reply from 172.217.2.238: bytes=32 time=55ms TTL=112
    Reply from 172.217.2.238: bytes=32 time=37ms TTL=112
    Reply from 172.217.2.238: bytes=32 time=36ms TTL=112
    Reply from 172.217.2.238: bytes=32 time=37ms TTL=112

    Ping statistics for 172.217.2.238:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss)
    Approximate round trip times in milli-seconds:
    Minimum = 36ms, Maximum = 55ms, Average = 41ms


    How to find dhcp server from command prompt in windows...

    ipconfig /all | find /i "DHCP Server"
    DHCP Server . . . . . . . . . . . : 192.168.1.254

    How to check from command prompt that dhcp server is working

    ping 192.168.1.254

    Pinging 192.168.1.254 with 32 bytes of data:
    Reply from 192.168.1.254: bytes=32 time=74ms TTL=64
    Reply from 192.168.1.254: bytes=32 time=6ms TTL=64
    Reply from 192.168.1.254: bytes=32 time=6ms TTL=64
    Reply from 192.168.1.254: bytes=32 time=6ms TTL=64

    Ping statistics for 192.168.1.254:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
    Approximate round trip times in milli-seconds:
    Minimum = 6ms, Maximum = 74ms, Average = 23ms

    How to see what servers are running in windows or at the least are configured for the nic card either automatically or hard wired as a setting

    ipconfig /all | find /i "Server"
    DHCP Server . . . . . . . . . . . : 192.168.1.254
    DNS Servers . . . . . . . . . . . : 192.168.1.254

    That's good stuff to know and it works. See below:

    dhcp server.JPG

  9. #199
    Service Manager 2,500+ 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
    below is one method... may not be what slimslob used but its valid...


    to check if dhcp is working is to ping host name of copier from command line in windows... if all things are connected and settings are good you should get a response... and it should respond with the ip address if it responds with the gibberish thats ipv6 you can force it to do ipv4

    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.

  10. #200
    IT Manager 5,000+ Posts bsm2's Avatar
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    Re: Need some advice on learning networking

    The only way it can resolve a hostname is through DNS not DHCP.

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