[Dnsmasq-discuss] dnsmasq on large scale network

[Petr Menšík]

Interesting, I am just debugging situation when multiple instances start
and request DHCP at similar time. Without no-ping option, it works quite
bad. Even starting 16 instances at the same time does not work reliably
to us with ping enabled. It seems our 2.79 version is broken, 2.81 were
fixed. But if you have 5 requests per seconds, I would use more heavy
server. Dnsmasq is great for small networks, but I think it has no
design for high performance. It does not scale well with hundreds or
thousands clients.

Make sure you use no-ping for good performance. Ping code does just one
at a time, which makes it quite slow if enabled. I would try dhcp-server
or kea, it seems you have big enough network.

Just my 2 cents.

Cheers,
Petr

On 12/5/21 19:44, Fabian Druschke wrote:
> Hey friends, i hope you all are doing fine.
>
> Currently i'm facing a little challenge. I have a large network with
> more or less 30k clients, and i need a router for NAT from the LAN
> subnets, in the 10.0.0.0/8 address space to the outside WAN public ip
> address. So it's a quite simple scenario.
>
> I've purchased a Juniper MX150 router already, but it was the wrong
> choice due to the lack of NAT support at all. So i wanted to use
> OpenWrt for this scenario, because it is really really simple to set
> up for this use.
>
> What i'm struggeling with, is the DHCP server included on OpenWrt. By
> default it's dnsmasq, and it's easy to configure through the LuCi web
> interface. Before going into production i'd like to make sure if
> dnsmasq is designed or capable to handle this amount of clients (peak
> 30k / 5 requests per second).
>
> Does someone have experience with such a scenario, and is there a
> proper tool to benchmark DHCP ?
>
>
> Thanks in advance!
>
>
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-- 
Petr Menšík
Software Engineer
Red Hat, http://www.redhat.com/
email: pemensik at redhat.com
PGP: DFCF908DB7C87E8E529925BC4931CA5B6C9FC5CB