Is a single NIC gateway possible?

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CheGevara2015-09-03 11:34:02

Computer networks

CheGevara, 2015-09-03 11:34:02

Perhaps a stupid question, but ...
* do not ask why, just wondering
Let's say there is a local server and a server distributing the Internet (two network ones).
Is it possible to do the following: in LAN, put a PC with one network, which will take the Internet from the server distributing the Internet and give it to other PCs in the same LAN (i.e. network one)

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6 answer(s)

A

Andrey Nikiforov, 2015-09-03
@CheGevara

Maybe.
You need to look towards virtual interfaces.
linuxconfig.org/configuring-virtual-network-interf...
You will then need to configure DHCP and routing through the virtual interface superuser.com/questions/548502/route-ip-through-vi...

T

throughtheether, 2015-09-03
@throughtheether

You can implement this using routing (for all PCs, your "gateway" is set as the default gateway, on the "gateway" - the distributing server)
Or you can implement the "router on a stick" scheme. You will need to support port-based VLAN and 802.1q tagging on the "gateway" and switch. In this case, the PC on the local network will not have direct access to the server.
"Non-standard solutions" with ARP substitution are also possible, but this is not for everyone.

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Melkij, 2015-09-03
@melkij

See vlan technology.

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TyzhSysAdmin, 2015-09-03
@POS_troi

yes, but not necessary.

S

Sergey, 2015-09-03
@edinorog

the most elementary thing is to understand virtual machines on virtualbox

A

Alexander Karabanov, 2015-09-16
@karabanov

Google about the router on the stick.
PS
There are two network cards, but:

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000
    link/ether 08:60:6e:7e:5b:7f brd ff:ff:ff:ff:ff:ff
3: eth1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN mode DEFAULT group default qlen 1000
    link/ether 00:14:d1:16:35:19 brd ff:ff:ff:ff:ff:ff
4: [email protected]: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default 
    link/ether 08:60:6e:7e:5b:7f brd ff:ff:ff:ff:ff:ff
5: [email protected]: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default 
    link/ether 08:60:6e:7e:5b:7f brd ff:ff:ff:ff:ff:ff
6: [email protected]: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default 
    link/ether 08:60:6e:7e:5b:7f brd ff:ff:ff:ff:ff:ff