1

Topic:

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.
So.
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
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
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.
Result:
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?
Thanks.

2

Re:

So we line totals:
It is necessary:
1) to unite 2 networks
2) on client  c client OS absolutely not not intended for such purposes! (And whence you only such undertake...)
3) setting of specialized iron and-or a software is impossible
4) on yesterday
Despite the full idiocy of the decision of a task in view like all at you it is correctly made
But you do not consider a singularity  nedo-brendmauera:
It will be  packets from another's subnets
That is machines 192.168.15.0/24 will reject any packets with 192.168.71.0/24 (or any other gray networks of excellent 192.168.15.0/24)
Output: adjust firewalls and other anticreatures by client machines and on your nedo-router if on them there are antiviruses it is necessary to look at their adjustments too
For tests it is possible to disconnect TEMPORARILY
Strongly I advise to familiarize with elements of networks and tools helping with debugging of these;
To begin with tracert (which output should be laid out here), to get acquainted with wireshark
But it is better:
Find the budget employ experts to make a network on
On points:
Mi81
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

It is not necessary and is senseless
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

DHCP and classless-static-routes did not transit, clearly-clearly
Probably, it is enough on old gateways (192.168.71.1 and 192.168.15.1) to register
It is possible, and it which as can will work, but it in the given topology not is correctly, it is better static routes on hosts
Or it is necessary to make gateways in both networks appropriate cards of the router;
And old gateways to degrade in normal nodes?

It depends that that at you the gateways, what Internet  there do.
But the Windows not is the correct decision for routing basically, well it is not intended for this purpose, even the server...
She on herself cannot drag 2 Internet + 2 subnets from a word "absolutely", is not able
I will repeat:
Find the budget employ experts to make a network on 

3

Re:

[off] asavah
From a word "absolutely", is not able
Well why, if the person cannot unite two cards in the bridge on "router", or cannot raise a mask to the same/17 (that formally breaks its topology), or cannot   (if an ultimate goal nevertheless in access to ) on.15.4 same https://defender13.livejournal.com/2298.html (since did not adjust up to the end or at it it is cut, therefore it is necessary to look comments in a post) it is not necessary here so that Windows absolutely and in any way... Does not cancel that through and it is better to guarantee all with the expert. [/off]

4

Re:

At me in 1996 two office grids were approximately so are connected (moreover through the modem) through two Windows NT 3.51 servers, and all worked. And now, suddenly, "it is not intended completely not"? She is able to send packets, so not "absolutely".

5

Re:

Thanks for answers.
About level of my preparation you are really right.
Simply former expert left and assigned that first comer who can from 3 meters
To distinguish Word from Excel, i.e. me smile
I will remind only that the Internet is not present in one of subnets.
Grids especially local without an output in an external world. Also it is not planned owing to
Office singularities.
asavah
Find the budget
Not in my competence. Office budgetary.
Money is not present. But we keep smile
asavah
It is not necessary and is senseless
And can then on "router" better so? -
route-p add 192.168.71.0 mask 255.255.255.0 192.168.71.1 metric 1 IF (the interface in 71st network)
route-p add 192.168.15.0 mask 255.255.255.0 192.168.15.1 metric 1 IF (the interface in 15th network)
I.e. at once  to "old" gateways, considering that IPEnableRouter
On "router" it is installed in unit. Or a nonsense?
asavah
It is better static routes on hosts
And it is possible an example route for them with reference to the described topology?
asavah
Firewalls and other anticreatures
Here it is a haemoplenty:  80 offices sad
Unless YAPM?
IgaX
Cannot raise a mask to the same/17
I.e. to set a mask 255.1.0.0, truly? For both subnets?
What will it gives in practice?
168 and 1 = 0, i.e. as a result - 192.0.0.0 for any packet - the invalid address of a node?
IgaX
   
I will ask not to express. What it, sborno-evacuation point or power supplies system?
gaz
Through two Windows NT 3.51 servers
That's just the point that here servers are not present. All OS client.
Networks peer-to-peer.
gaz
In 1996
I certainly understand that the decision considered by me approximately 20-year-old prescription;
But while on new decisions is not present either means, or time, knowledge (very much I hope that only while).
By an outcome of day on Monday all should work.
Also will work! I am persevering and  smile

6

Re:

[off] Mi81
That it gives in practice?
You receive a uniform subnet on l3 at saving of current addressing of hosts, sometimes it makes sense, if on it many nails from the same , level of applications  are hung up. Also it would not be desirable all is thin to set up (or not sense).
I.e. to set a mask 255.1.0.0, truly? For both subnets?
No, 255.255.128.0, simply to specify this mask for each host (any method), it will be formal one subnet: https://ip-calculator.ru/#!ip=192.168.0.0/17 with volume in 32 766 hosts which "absorbs" your current addressing at saving of all other communications and properties for the same level private (which it is normal in such cases and costs)... If topology not dogma certainly. [/off]

7

Re:

Mi81
Direction to you set IgaX
It is necessary  to include in not clearly what OS of packets.
But to deliver a certain router all the same is easier and cheaper. Or instead of windows to install any ubuntu;
There it is much more convenient.
[off]
Also it is not planned owing to office singularities.
Well it and on "" it is possible to guess smile
[/off]

8

Re:

IgaX
No, 255.255.128.0
. Did not see about little-endian.
At today's level of my understanding of a question (rather low) packets in 15th and 71st networks
(Provided that addressing on hosts will not change) will be cut with a mask, since
128 and 71 = 0 and 128 and 15 = 0. Is not present?
It was ideal 255.255.79.0 (where 79 = 71 | 15).
But such barbarity as I understand, is forbidden by the specification sad

9

Re:

Mi81 :
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.
So.
To router cards addresses are appropriated:
192.168.71.11 (in 71st network);
192.168.15.4 (in 15th network).

1) the First network 192.168.71.0 (we will name its 71st).
192.168.71.X address
Mask 255.255.255.0
default gateway: 192.168.71.11 (the PC router address in the given network)
2) a PC Router
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\IPEnableRouter = 1
192.168.71.11 (in 71st network);
Mask 255.255.255.0
default gateway: it is empty
192.168.15.4 (in 15th network).
Mask 255.255.255.0
default gateway: it is empty
To overload after adjustments.
3) the Second - 192.168.15.0 (accordingly 15th).
192.168.15.X address
Mask 255.255.255.0
default gateway: 192.168.15.4 (the address of a PC router of the given network)
And all! Any static routes anywhere manually it is not necessary to register. And any routers it is not necessary to buy, windows it is fine with such trivial task consults.
If not  among themselves machines in different networks to disconnect on them firewall or to adjust it that accepted ICMP requests from all addresses, and not just with  a native network (so it is adjusted by default normally).
PS did not note on 71 networks the Gateway 192.168.71.1 (optical fiber), I so understand it for an Internet.
Then  a PC router will be such:
2) a PC Router
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\IPEnableRouter = 1
192.168.71.11 (in 71st network);
Mask 255.255.255.0
default gateway: it is empty
192.168.15.4 (in 15th network).
Mask 255.255.255.0
default gateway: it is empty
Plus to add a static route for all remaining packets to not concerning to 15 and 17 networks in the gateway the least priority:
route-p add 0.0.0.0 mask 0.0.0.0 192.168.71.1 metric 20

10

Re:

AYM
Easier and more cheaply.
It agree. But at observance of one of two conditions.
Or the router already is available, or 1 copeck is less than zero of copecks.
In my case any condition is not observed.
It is necessary  to include In not clearly what OS of packets.
Not absolutely understood. Speech about OS or about a node?
In my case  it is included by that machine which I name "router".
Adding from 4/1/2018 10:58:
kseon
And all! Any static routes anywhere manually it is not necessary to register.
Thanks that were connected to elimination of gaps in my formation smile
Now it is clear, why all the same one machine behind "router" in 71st network  from 15th.
Now recalled that when dug, disconnected on it a firewall.
At it and asavah hinted in the first post.
Adding from 4/1/2018 11:03:
kseon
To adjust it that accepted ICMP requests from all addresses, and not just with  a native network
One more thanks smile
Detailing very valuable to me, since stupid switch-off of a firewall or a firewall
On constant on all hosts, probably, not so wise decision from the point of view of safety of the information.
Unless for tests as specified asavah .
And what if to make how I wrote in it a post ?
Namely:
Mi81
And can then on "router" better so? -
route-p add 192.168.71.0 mask 255.255.255.0 192.168.71.1 metric 1 IF (the interface in 71st network)
route-p add 192.168.15.0 mask 255.255.255.0 192.168.15.1 metric 1 IF (the interface in 15th network)
I.e. at once  to "old" gateways, considering that IPEnableRouter
On "router" it is installed in unit. Or a nonsense?

At my uneducated sight, "router", receiving a packet addressed in 71st network
It through the interface specified in IF on "the old" gateway 192.168.1.1 which, on idea, knows that with it
To do further.
Thus it is not important on what interface of "router" initially the packet since on "router" it is included  arrives.
I am not right?
Adding from 4/1/2018 11:28:
kseon
I so understand it for an Internet.
The Internet is not present on determination and is not planned that as I understand, simplifies the task.
The output in exterior networks from a network is forbidden by a corporate policy.
Mail corporate, especially internal.
Internet only by the independent machines which in any way have been not connected to a network.
Only two  which also should be united in one.
Simply were under construction at various times. Older on twisted pair.
Newer - on .
However, it is a lot of years, seemingly, they were ownerless.
There are even IP-addressing and topology circuits sad
I do not say that is created on hosts: and in sense of a software, and in sense of adjustment;
And in sense of safety of the information.
Coercion of everyone in the elementary order occupies from 3 o'clock till 2 days.
At the former expert as it was clarified, was not not only the computer, but
Even an office where it could accept a pose of the Thinker.

11

Re:

Mi81
The Internet only by the independent machines which in any way have been not connected to a network.
Only two  which also should be united in one.

Then it is not clear, what you named the gateway by the machine with 192.168.71.1 address?
Anyway, I wrote above two variants. smile

12

Re:

kseon
[i] That you named the gateway by the machine with 192.168.71.1 [/i address
The normal machine which is specified by the gateway on all hosts of 71st network.
That I name the gateway in a subnet 192.168.15.0, too the normal machine, which interface
It is specified by the gateway on all hosts of this subnet.
I, probably, am still feeble in terminology.
Therefore  a picture from the first post though, probably, it is better route print, but today the day off:

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Re:

71.1 and 15.1 at you gateways are designated. Gateways where?

14

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AYM
Gateways where?
I find it difficult to answer.
Probably, in the subnet because it is more to what these machines are not connected physically.
More shortly, in adjustments TCP/IP for each host in 71st network it is registered about the following
(In 15th - it is similar, only the gateway specifies the machine 192.168.15.1), i.e.
Two elementary networks without any servers, hardware routers and routers:

15

Re:

Mi81
Probably, in the subnet because it is more to what these machines are not connected physically.
More shortly, in adjustments TCP/IP for each host in 71st network it is registered about the following
(In 15th - it is similar, only the gateway specifies the machine 192.168.15.1):

If at you as you wrote above only two local networks, without an exterior output. That you had very cheerful administrator:gigi:

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Re:

kseon
That you had very cheerful administrator
I too love humour, but it would be desirable direct the orders smile
Now the operative decision on submission of internal mail in 15th network simply is required;
And for this purpose, at least, it is necessary ping, but as of evening of Friday I was more likely sad, than oars, alas.
However, by means of respected  the fog in a head, like, starts to dissipate;
But while very slowly, most likely, because of my denseness. It is visible, it is too much it smile
Let's pass to arguing of a final candidate solution if dear gurus do not object?

17

Re:

Mi81
Now the operative decision on submission of internal mail in 15th network, simply is required
, at least three variants:
1) I  described above. Firewall a rule for ICMP can . For example here:
https://answers.microsoft.com/en-us/win … 3a99f1cae6
2) you can simply change addresses in one network, to addressing in another. That is to create one network on two physical environments. And it is stupid to include the bridge in a PC Router.
3) On a PC Router by means of RRAS services to create NAT translation IP of addresses of the sender. In other words, to create the gateway with NAT, that is packets will walk from one network in another pretending to be native addresses for a network.

18

Re:

kseon
You can simply change addresses in one network, to addressing in another.
Excuse, but for the present it is required to chew, as to the baby.
That that for you self-evident, for me is not always transparent.
I.e. all to attribute to a network 192.168.71.0, setting hosts in 15th network of the address from space of 71st and assigning the main gateway for them 192.168.71.1?
Both cards of "router" too to attribute to 71st and on both above specified gateway?
What masks in subnets thus will be?
Whether manipulations with routing by any machines are necessary in this case?

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Re:

We tell about a sentence 2) - a PC Router in a mode the bridge between two network cards.
Mi81
That that for you self-evident, for me is not always transparent.
I.e. all to attribute to a network 192.168.71.0, setting hosts in 15th network of the address from space of 71st

Yes, all computers in two segments (the optics and twisted pair) have one address space for example 192.168.71.X.
Both cards of "router" too to attribute to 71st?
Naturally.
And on both above specified gateway
Any gateways in case of a network with one address space and without an output outside, does not register anywhere!
Field the Main gateway - the Gateway by default - Default Gateway - on all computers empty.
What masks in subnets thus will be?
If you totally on two segments have less than 254 computers, 255.255.255.0
Whether manipulations with routing by any machines Are necessary in this case?
No.

20

Re:

Mi81
And generally these.1 in the nature are?
Not easier on these IP and to plant that ""?
kseon
And NAT to it what for?

21

Re:

AYM
And generally these.1 in the nature are?
Not easier on these IP and to plant that ""?

As though yes, to appropriate these addresses on its PC router a computer. And to replace them with others in initial (two) machines. But something prompts to me that all the same to it  all computers .
And NAT to it what for?
Well as one of methods of a solution of a problem why not to consider for the general development smile Then firewall not  will pull.
To Mi81;
Forgot to specify in all points that you on a PC Router disconnected firewall generally. Otherwise I feel the ends do not find.

22

Re:

kseon
All the same to it  all computers .
Alas and ah sad
One encourages - in 15th network, unlike the resulted conditional circuit, only 4 computers, including so-called "router". smile
While in 71st actually them 75.:weep:
Adding from 4/1/2018 15:15:
kseon
On a PC Router disconnected firewall generally.
It is already made.

23

Re:

Mi81
Can these 4  in other network translate and all?

24

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[off] IgaX
That is not necessary here so that Windows absolutely and in any way
I repeat for those who in the tank: absolutely and in any way
The Windows itself are not able, the indirect software is not considered, the same Kerio winroute like was able (whether I do not know this product) is live
Tell to me how to make on the Windows unpretentious dual-wan with PBR?
And I to you will tell - in any way and absolutely
The official answer from forums  (laziness to search ) - " is not intended for these purposes, use the specialized equipment" [/off]