[Cake] Re: help request for cake on a large network

[Frantisek Borsik <frantisek.borsik@gmail.com>]

Jaap - thank you very much for recommending LibreQoS.

Yes, besides a typical last-mile ISP scenario, LibreQoS is being used in
various other setups, like to help with event Wi-Fi - here is one of the
deployments https://libreqos.io/2023/11/13/success-story-raceway/

To brag a little, other deployment scenarios we see are data centers,
cruise ships, university campuses, even mines :)

All the best,

Frank

Frantisek (Frank) Borsik


*In loving memory of Dave Täht: *1965-2025

https://libreqos.io/2025/04/01/in-loving-memory-of-dave/


https://www.linkedin.com/in/frantisekborsik

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frantisek.borsik@gmail.com


On Sun, Sep 28, 2025 at 2:38 PM David Lang <david@lang.hm> wrote:

> I guess I didn't give enough info on our network architecture.
>
> The upstream ISP is between 500Mb and 1G.
>
> We disconnect the conference center firewall and connect our firewall in
> it's
> place (Linux system)
>
> This border router connect to the conference center firewall (so their
> offices
> still get connectivity), and to two routers (Linux, one per building) that
> are
> also direct connected (a triangle between the three routers. The border
> router
> is doing NAT for IPv4 and MSS squashing for IPV6 that goes out through a
> tunnel
> (google doesn't do PMTU discovery on IPv6)
>
> (we are currently debating between deploying OSPF between the three
> routers, or
> just giving them static routes, high priority direct and low priority for
> the
> indirect path)
>
> Each building router then connects to one or a few switches in different
> closets
> that then go to a switch in each room (trunked ports).
> We hve a handful of wired users, 120APs for the users, and AV equipment
> for each
> of the 16 tracks that are recorded and streamed.
>
> a quick look at libreqos and it's pushing for a more complex network
> layout that
> will be a hard sell at least this year (last year our juniper routers fell
> over
> under the MSS squashing load for IPv6, so we are going to Linux systems
> this
> year, getting people to consider cake is hard enough, let alone another
> middleware box)
>
> David Lang
>
> On Sun, 28 Sep 2025, Jaap de Vos wrote:
>
> > Date: Sun, 28 Sep 2025 14:12:24 +0200 (CEST)
> > From: Jaap de Vos <m@jaap.pro>
> > Reply-To: "cake@lists.bufferbloat.net" <cake@lists.bufferbloat.net>
> > To: David Lang <david@lang.hm>, cake@lists.bufferbloat.net
> > Subject: Re: [Cake] help request for cake on a large network
> >
> > Hi David,
> >
> > I haven't tried it myself yet, but this sounds like a use case for which
> LibreQoS is suitable. However, LibreQoS would fit best if you can build
> something in line with the design assumptions:
> https://libreqos.readthedocs.io/en/latest/docs/v2.0/design.html
> > Specifically the part about putting it in between other routers and
> running a routing protocol with those.
> >
> > There are some good recommendations around suitable hardware and
> sizing/scaling too:
> https://libreqos.readthedocs.io/en/latest/docs/v2.0/requirements.html
> >
> > What kind of upstream bandwidth are you working with at the conference?
> I run the Mikrotik implementation of CAKE on a campsite. It really helps to
> get the most out of our asymmetrical gigabit coax line over there, no fiber
> available yet. So far, we got close to 500 devices on our outdoor Wi-Fi
> network with mostly good experiences, amazing. Before that, FQ_CoDel on
> PfSense worked well too, but the network wasn't as busy back then. I'd like
> to see CAKE on BSD some day.
> >
> > Kind regards,
> > Jaap de Vos
> >
> >
> >> On 09/28/2025 1:06 PM CEST David Lang <david@lang.hm> wrote:
> >>
> >>
> >> I'm starting to prepare for the next Scale conference and we are
> switching from
> >> Juniper routers to Linux routers. This gives me the ability to
> implement cake.
> >>
> >> One problem we have is classes that tell everyone 'go download this'
> that
> >> trigger hundreds of people to hammer the network at the same time (this
> is both
> >> a wifi and a network bandwidth issue, wifi is being worked on)
> >>
> >> The network is pretty flat, a couple of subnets each on ipv4 and ipv6.
> >>
> >> Any suggestions on how to configure cake for this sort of environment
> where
> >> there are so many devices?
> >>
> >> David Lang
> >> _______________________________________________
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> >
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