Site to Site Replication Design with same subnets

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Site to Site Replication Design with same subnets

Veeam Logoby w.vella » Thu Jun 22, 2017 8:48 am

Hi all,

I would like to ask for assistance/advice from some one that maybe already had a related setup. I contacted Veeam and they were very helpful but unfortunately couldn't help me much at the network part so that 's why I am asking in this forum.

I am planning to have a DR replication to another site. Currently we have two sites, where in the main site he have a VMware cluster and in the secondary site he have another cluster in which the Replication VMs will be stored. Between the sites, we have a Point-to-Point 80/80Mbps WAN link provided by the ISP so we could communicate at the other site without any VPN etc.

The plan is that the replication is made to the DR site without changing the IPs because with the same IPs for some Apps but if we do so, we would create network issues (Duplicate IPs and gateways). How can this be handled? Maybe create VXLAN (layer 2 vpn) between the two sites so we do not cause duplicate IPs etc. Any help would be greatly appreciated :D
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Re: Site to Site Replication Design with same subnets

Veeam Logoby v.Eremin » Thu Jun 22, 2017 11:26 am

I think you have two options here. Either assign new IPs to replica VMs (RE-IP) and make sure that names can be resolved to new addresses in case of partial site failover or leave Replica VMs IPs intact and guarantee that only one VM with the same is running in each moment of time to avoid duplicate address conflicts. Thanks.
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Re: Site to Site Replication Design with same subnets

Veeam Logoby w.vella » Thu Jun 22, 2017 2:13 pm

Unfortunately we still cannot leave only one VM running since there will be still two gateways in the same network (One in the Primary Site and the other in the Secondary Site).
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Re: Site to Site Replication Design with same subnets

Veeam Logoby dellock6 » Sat Jun 24, 2017 8:34 am

Hi, replication can happen even without re-ip, the issues will only surface if you power on the DR machines. You can still test the machines using surereplica, and the virtual lab will keep the two identical IPs separated,even if the two sites are connected at L2.
During a real failover, the duplicate issue will not be a problem, since the original vm will be down.

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Re: Site to Site Replication Design with same subnets

Veeam Logoby w.vella » Mon Jun 26, 2017 7:19 am

Thanks Luca,

But then I cannot have a partial failover?
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Re: Site to Site Replication Design with same subnets

Veeam Logoby v.Eremin » Mon Jun 26, 2017 10:53 am

Not sure whether I follow you on that. During partial failover production VM will be down, so within extended network there will be only one machine with the given IP.

May be you can share some details regarding your IP scheme, so that we understand your concern about duplicates better?
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