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I have below A B C devices in a work LAN, but no permission of the office switch.

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in the office LAN:
A.a router (I want to expand a physical net port and it's what I happen to have at hand)
B.friend's computer (which provides some file and web services inside the office)

in my router's LAN:
C.my laptop
and maybe more mobile devices later

Is there a way for laptop C to access computer B ?
Computer B to laptop C is otherwise not important.

Similar questions must be asked somewhere but I'm poor at summerizing keywords... Any link or ref would be appreciated.

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You need to tell the both router how the subnets are connected:

  • the router 192.168.1.1 should send data for 192.168.2.x over the router 192.168.1.100
  • the router 192.168.2.1 should send data for 192.168.1.x over 192.168.1.100, it should do this without special configuration if the subnet mask is set correctly.
| improve this answer | |
  • Thanks @user3767013 for your clarification. Silly me not even gave 1.101 a ping ..._(:3」∠)_ ....The router and the 1.101 computer are under the same subnet so 2.x devices could connect to 1.101 with no effort (though not inversely). Thanks again. – ywy Aug 19 '16 at 9:44

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