Hi, While it might seem weird, it is a valid scenario. There might be reasons to let reusing IP addresses.
To answer your question about deployment of NAT devices, it shouldn't be just a NAT device. Each LAN segment can have its own NAT gateway. Regards, On Wed, Feb 22, 2017 at 4:07 PM, /dev/rob0 <r...@gmx.co.uk> wrote: > On Wed, Feb 22, 2017 at 02:55:30PM +0100, S. M. Hossein Hamidi wrote: > > I am new to dnsmasq and my mind is busy with a DHCP scenario that I > > would like to consult with you before getting my hands dirty. > > > > Suppose that we have several subnets which are behind a NAT device > > which additionally acts as a DHCP relay agent. I know that using > > DHCP relay agent information option, I can distinguish between > > different subnets. However, the additional constraint is to use > > duplicate or overlapping subnets instead of distinct subnets. > > That is a very strange constraint. RFC 1918 is quite large enough; > it's not necessary to share your netblocks. And how will your NAT > device distinguish one segment with a shared netblock from another > segment using the same netblock? > > Sounds like broken IP networking to me. Compliant IP stacks do > routing based on IP address blocks. > > > Since, the traffic comes from each segment goes through NAT, it > > wouldn't be any problem to use duplicate IP addresses, knowing > > that each segment has its own autonomy. > > But again, how does the NAT device do this? > > > So, may I know if can I exploit tagging feature of dnsmasq so > > that it can handle separate potentially overlapping leases for > > each subnet? > > I'm pretty sure this would not be possible in dnsmasq nor in ISC > dhcpd. Either one could do a single netblock shared among many > distinct segments, but each would only be able to give out any one > address to only one client. > > But wait and see what Simon says. :) > -- > http://rob0.nodns4.us/ > Offlist GMX mail is seen only if "/dev/rob0" is in the Subject: > > _______________________________________________ > Dnsmasq-discuss mailing list > Dnsmasq-discuss@lists.thekelleys.org.uk > http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss >
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