I know that the question was chewed tens times, but, unfortunately, personally for me remained actual;
Though search used also something useful here obtained.
There are two small peer-to-peer networks (without the selected server and the Internet) two subdividings.
In one of them the email server works.
In connection with necessity to organize electronic mail in the second subdividing, it was required
Cheap but good to connect two networks in one.
The topological circuit for today in nesting in the end of a post.
The first network 192.168.71.0 (we will name its 71st).
The second - 192.168.15.0 (accordingly 15th).
The gateway of 71st network 192.168.71.1 (optical fiber).
In the second - 192.168.15.1 (twisted pair).
For join of networks attempt to include in their composition PEVM with two network cards is undertaken;
Which further I will name a router.
To eliminate flood, I will note that the bridge organization not - does not work.
To router cards addresses are appropriated:
192.168.71.11 (in 71st network);
192.168.15.4 (in 15th network).
Besides, on a router routing is set:
route-p add 192.168.71.0 mask 255.255.255.0 192.168.71.11 metric 1
route-p add 192.168.15.0 mask 255.255.255.0 192.168.15.4 metric 1
for redirection of packets in appropriate subnets;
And as parameter IPEnableRouter in a branch is installed in unit
On all nodes in 71st network the route is set:
route-p add 192.168.15.0 mask 255.255.255.0 192.168.71.11 metric 1
and in 15th network:
route-p add 192.168.71.0 mask 255.255.255.0 192.168.15.4 metric 1
However, on gateways it is not made.
From 71st network a card 192.168.15.4, but more any node in 15th network it is unattainable.
From 15th network 192.168.71.11 and one node of 71st network (Win7, possibly, I made something in adjustments of this machine, but itself did not understand that).
All machines in both networks under Windows (WinXP, Win7, Win10).
Someone from the guru can answers that I do not and that else it is necessary to make.
One request - not to advise setting of any servers.
There is no time for radical realignment.
The topology, composition program and hardware should remain such as is.
All needs to be made means of OS and quickly.
Probably, it is enough on old gateways (192.168.71.1 and 192.168.15.1) to register
Routing as well as on remaining hosts of appropriate segments (above
I wrote, what it is not made yet)?
Or it is necessary to make gateways in both networks appropriate cards of the router;
And old gateways to degrade in normal nodes?