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Old 05-08-2015, 09:40 PM   #1
Registered: Dec 2014
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simple networking question

hello everyone, pretty sure this is a dumb question, but I was wondering if it is possible to find the gateway of a given ip?

lets say (fake ip)

the reason i ask is i had to set up the printer at a room manually, and I had to add in the subnet mask and the gateway.

I pretty much went to a windows machine from my office to get the gateway and added that gateway address lets say the office room had a subnet of 131.22.90.x

however, when i added it to the printer, turned out the gate way was different. turned out the gateway was
and lets say this room had a subnet of 131.22.80.x

what determines the gateway? if the network is, shouldnt it be same gateway no matter which room? why wouldnt the printer work with the gateway of the office?
(using fake ip addresses)

to add on, we are using a linux dns server
Old 05-08-2015, 09:56 PM   #2
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The gateway is completely arbitrary and unrelated to network/netmask.
"Usually" (on soho router setups) it is a member of the subnet but that's not necessary.
Old 05-09-2015, 12:13 AM   #3
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Registered: May 2015
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simple networking question

for starters a print server will be needed use it that way the print server looks similar to an internet router/modem and the printer will get shared this way
Old 05-12-2015, 07:38 PM   #4
Registered: Apr 2013
Location: Arlington, WA
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The only time a gateway is needed is for communication with hosts that are not on the local sub-net. As long as the IP address and netmask are correct, the printer should work with computers that are "local". If your office is part of a large company, you may have VLANs separating different business segments (ie. finance, HR, engineering, production). If this is the case then you would need the correct gateway address for computer outside your local subnet to work with your printer but computers inside your local subnet would work.

To clarify what decendant_command wrote, a gateway _does_ need to be on the subnet. Otherwise your computer (or printer) wouldn't know how to get to it. More technically, the gateway must be a member of the same broadcast domain as the hosts it services.

The gateway (address) is determined by the network administrator during design. Usually it is the lowest or highest address in the broadcast domain. For the case of
Network address (unusable):
Possible Gateway addr (low):
Possible Gateway addr (hi):
Broadcast addr:

It looks to me that multiple broadcast domains are being used. Maybe you should talk to your network administrator.


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