04-27-2022 02:19 AM
HI if A company with 10.0.0.0/8 subnet acquired a company B which also having 10.0.0.0/8 range IP. how we can we resolve this scenario as both are using same subnet.
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04-27-2022 02:35 AM
That is a large range so there may not be any overlapping but if there is basically you need to look to readdress the subnets that do.
As a temporary measure you may be able to use NAT to communicate between subnets using the same range but that would only be a short term solution, you really need to readdress.
Jon
04-27-2022 03:52 AM
Jon already mentioned the best option (readdress the network) and the worst option (NAT). There is a third that at least should be evaluated: Adding IPv6 on top of both networks for the systems that need to communicate with each other.
04-27-2022 02:22 AM
Additing some details
Company have DMVPN and using EIGRP for routing.
04-27-2022 02:22 AM
Adding some details
Company A have DMVPN and using EIGRP for routing.
04-27-2022 02:35 AM
That is a large range so there may not be any overlapping but if there is basically you need to look to readdress the subnets that do.
As a temporary measure you may be able to use NAT to communicate between subnets using the same range but that would only be a short term solution, you really need to readdress.
Jon
04-27-2022 03:52 AM
Jon already mentioned the best option (readdress the network) and the worst option (NAT). There is a third that at least should be evaluated: Adding IPv6 on top of both networks for the systems that need to communicate with each other.
04-27-2022 09:22 AM
Just to add to what @Jon Marshall and @Karsten Iwen have noted, the NAT they refer to, I believe, is known as "double NAT".
Another issue you can easily run into, especially in the case of using two /8s, what address block do you map to for the other side to "see"?
Having been in this situation, i.e. merging two companies both using 10.0.0.0/8, you may end up NATting only some address blocks that really, really need to be accessed from the other side. You then work, to try to partition 10.0.0.0/8 such that it can be "shared", without overlap, by the two companies.
BTW, in the (rather large) company where I encountered this situation, the new to be added company only used part of 10.0.0.0/8, as most companies would, however, our company actually used all of 10.0.0.0/8 (and 172.16.0.0/12 and 192.168.0.0/16). (We were early adopters of IPv6 due to depletion of all IPv4 private address space.)
04-29-2022 11:46 PM
@prakashcsco wrote:
A company with 10.0.0.0/8 subnet acquired a company B which also having 10.0.0.0/8 range IP.
That's a trick question. 10.0.0.0/8 is a private IP address. No single individual or company "owns" this subnet.
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