Routing Query

[AkbarAliSheikh]

Hi All,

We are in middle of merging another company with ours. All computers, printers and servers in that company are using public IP addressing, internally and externally. We are using private IP addressing internally and only public IP addressing externally. We have implemented a firewall between these networks and have tried to set up a static routes but get issues as asymetric routing.

Can someone advise if using NATing and translating the public IP used by that company into one of the private addressing ranges of our company beforing coming to our network would resolve this issue?

Thank you for your advise in advance.

Regards,

Akbar Ali Sheikh

[jeevak mukadam]

Please provide your private and public ip range.Which routing protocol you are using for internal network.

[AkbarAliSheikh]

We are using private ranges from 192.168.1.0/24 - 192.168.80.0/24 and the public are 10.201.207.0/21 where as the other company is using 10.146.64.0/18 & 10.192.95.128/25 both internally and externally.

[jeevak mukadam]

Hello Akbar,

I havent seen any public ip all above ip range mentioned are private ips.

[AkbarAliSheikh]

Hi Jeevak,

This range is used by BT cloud within Internet and is used within that.

[Praveen AR]

Hi Akbar Ali,

You can use static NAT

http://www.cisco.com/en/US/tech/tk648/tk361/technologies_tech_note09186a0080093f31.shtml

[jeevak mukadam]

In the above mentioned scnario no need to use natting.

[edondurguti]

Hi,

These are private ip addresses:

RFC1918 name	IP address range	number of addresses	classful description	largest CIDR block (subnet mask)	host id size	mask bits
24-bit block	10.0.0.0 - 10.255.255.255	16,777,216	single class A network	10.0.0.0/8 (255.0.0.0)	24 bits	8 bits
20-bit block	172.16.0.0 - 172.31.255.255	1,048,576	16 contiguous class B network	172.16.0.0/12 (255.240.0.0)	20 bits	12 bits
16-bit block	192.168.0.0 - 192.168.255.255	65,536	256 contiguous class C network	192.168.0.0/16 (255.255.0.0)	16 bits	16 bits

Are you using any routing protocol, or are you doing static routes?

You will need an edge router that will connect your Company with their Company, then advertise your routes to them and their routes to you.