Public IP's add to Local network

RouterOS General
1

I have ISP IP’s x.x.x.160 – x.x.x.176, and I need setup router to give this IP’s also to my local network through Public interface.
How to setup both interfaces Local and Public networks to work with same IP’s?

2

Use FULL NAT. Full NAT scenario is most suitable on your case,
http://wiki.mikrotik.com/wiki/How_to_link_Public_addresses_to_Local_ones

3

Depend ot this I must add to Pub;ic addresses all external IP’s from 160 - 176 and give to clients fake addresses or I can give also ISP addresses?

4

Yes, you are correct.
Assing public address to the remote interface, client will use local address, router perfroms address translation from public to local and vice versa.

5

There is also other way.
The network mask from your provider is x.x.x.160/28
You can devide the network into two small ones with mask 29 each:
x.x.x.160/29
x.x.x.168/29

The first one use with WAN interface and second one with LAN interface.
Then put a proper gateway from provider in your route table (which is actually made)

Then you can use 5 ip in your network.
You lose some ips but it works also.

Regards
Marcin

6

Or better still, breakdown your /28 IPs as follows:

x.x.x.160/29
x.x.x.168/30
x.x.x.172/30

Use one of the /30 range on your wan. You are now free to assign the remaining /30 and /29 range on your lan interface. This way, you have 6 IPs to assign to your clients. No NAT, only routing.

7

huh :slight_smile:

My example you can also mix with sergejs soulution :wink:
Some users with NAT and some with routing.

Regards
Marcin

8

skillful
I need all IP’s


My ISP have range x.x.x.160/24 and from this give me IP’s from 160-176 incuding

9

If you need all ips then use the sergejs example.

With routing it is not possible.

Regards
Marcin

10

If you must maximize IP usage, you have to follow Sergejs’ suggestion.

11

I also try to put to Local network range x.x.x.160/28 depend on this that all ISP range are x.x.x.1/24
And this didn’t work why? :confused:

12

Your lan and wan cannot be in the same IP range (subnet)

13

skillful
I try put differents ranges: ISP have x.x.131.1/24 (in Public my address was x.x.131.160/24), but on Local interface i try to pur x.x.131.161/28

14

Peace, the x.x.131.161/28 IP range (x.x.131.160 - 175) is included in the x.x.131.160/24 range (x.x.131.0 - 255), so it is still the same network.

15

Dear Peace

Please read first about basic of addresing and subnetting
http://www.zytrax.com/tech/protocols/ip-classes.html

Regards
Marcin

16

skillful, mortin

Thanks i understand this :slight_smile: