[AusNOG] Mikrotik routers and "VLAN trunking over WAN"

Wed Jun 18 14:08:44 EST 2014

I believe the load balancing in question might not be relating to proper 
load balancing, rather certain services using certain links and failover 
links in case of primary failure.

Depending on budget, RouterBOARDs are moving away from MIPS CPU's, their 
newest range are based on tilegx muli-core CPU's (and still some PowerPC 
CPU's).

I can tell you now, a 951-2n Mikrotik with 600mhz mips CPU can handle 
~140mbit of traffic via 2 WAN's with NAT, route marking and QoS in 
place, and thats probably lowest price point unit you can get ($60~)

On 18/06/14 13:44, John Gavrilita wrote:
>
> Can't disagree with you, Matt, however it'll come at an expense of a 
> slightly increased CPU usage. And we all know just how easily that 
> mips CPU can be overwhelmed. It depends how many pps, of course.
>
> Other "effects" out there, Ross, may be PMTU discovery, MTU/MRU/MSS 
> issues, latency, imo will change rapidly, especially when used across 
> 3G links.
>
> If the user will throw privacy over the links, then expect the 
> aforementioned effects amplify many folds.
>
> As with which Mikrotik device will achieve this then the answer is any 
> of them, as long as:
>
> 1.The license is correct
>
> 2.The device is budgeted to suit the pps number.
>
> Cheers J
>
> *From:*Matt Ayre [mailto:matt.ayre at bigair.net.au]
> *Sent:* Wednesday, 18 June 2014 1:30 PM
> *To:* John Gavrilita
> *Cc:* Ross Wheeler; ausnog at lists.ausnog.net
> *Subject:* Re: [AusNOG] Mikrotik routers and "VLAN trunking over WAN"
>
> Re "out of order segments", that is why pretty much all modern 
> platforms include L3/L4 data points for flow hashing, whether 
> routing/forwarding or bundle load balancing.
>
> Even eeek MikroTik ;)
>
> Cheers,
>
> Matt
>
> On 18 June 2014 11:50, John Gavrilita 
> <jgavrilita at thesummitgroup.com.au 
> <mailto:jgavrilita at thesummitgroup.com.au>> wrote:
>
>     Hi Ross,
>     The first thing that crossed my mind is the inevitable situation
>     when packets will arrive out of order because the designed
>     solution uses bandwidth aggregation / load balancing. For TCP it's
>     ok, but for UDP it'll be a nightmare and the users will literally
>     hear it.
>     Mikrotik is a nifty platform, and as with any other device, one
>     has to know how to cook it.
>     Cheers :)
>
>
>
>
>
>     John Gavrilita
>     Network Engineer
>
>     Summit IT Management | Summit Internet | Summit Creative - 'reach
>     your peak'
>     Divisions of The Summit Group (Australia) Pty Ltd
>
>     Phone (Australia):    1300 049 749
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>     E-mail: jgavrilita at thesummitgroup.com.au
>     <mailto:jgavrilita at thesummitgroup.com.au>
>     Internet: http://www.thesummitgroup.com.au/
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>
>
> *
>
> John Gavrilita
> Network Engineer
>
> *
>
> Summit IT Management <http://www.thesummitgroup.com.au> | Summit 
> Internet <http://www.summitinternet.com.au>| Summit Creative 
> <http://www.summitcreative.com.au>- 'reach your peak'
> Divisions of The Summit Group (Australia) Pty Ltd
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>
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>
>     -----Original Message-----
>     From: AusNOG [mailto:ausnog-bounces at lists.ausnog.net
>     <mailto:ausnog-bounces at lists.ausnog.net>] On Behalf Of Ross Wheeler
>     Sent: Wednesday, 18 June 2014 11:04 AM
>     To: ausnog at lists.ausnog.net <mailto:ausnog at lists.ausnog.net>
>     Subject: [AusNOG] Mikrotik routers and "VLAN trunking over WAN"
>
>
>     Looking for someone with Mikrotik experience to confirm which
>     devices (any? all?) might achieve the desired outcome here.
>
>     Basically there are a number of sites of varying sizes, but for
>     the purposes of argument, lets say 20 sites.
>
>     Most sites are proposed to have at least two diverse paths. These
>     could be ADSL, Microwave, 3G/4G/LTE etc. The point is, different
>     providers, different paths.
>
>     Each site has it's (n) paths connected to interfaces on a Mikrotik
>     router which can aggregate bandwidth across (n) links (and reduce
>     latency
>     somewhat) while providing an ability to withstand (n-1) link failures.
>
>     The user further intends making extensive use of VLANs to "isolate"
>     services (eg, phones, computers, security devices, "public"
>     devices etc).
>     Thus it would be entirely likely that there could be 40 switches
>     at 20 sites, each with 10.10.8.0/22 <http://10.10.8.0/22> for
>     "phones" all on VLAN8.
>
>     Not withstanding how YOU might do it, is there an intrinsic
>     problem with the design (or Mikrotik as the each sites 'edge
>     device') as it stands?
>
>     Thanks in advance,
>     RossW
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