multiple uplinks from ISP

[mc]

dst-ip is not supported on one side of the switch.
src-mac does not work too, due to the fact that this would lead to a biased 
result, causing most of the traffic goes thru the first link.
dst-mac would not work as the machine is sending traffic to a single router.

> fxp0: 1.2.3.1/30
> fxp1: 1.2.3.5/30
> em0: 10.123.123.102/24
Does this imply I just need to ask my ISP for two /30 and two default 
gateways and that's it? No other 'special' configuration or registration 
procedures would be needed?

One more question, did you mean if I am to use quagga as the bgp daemon, I 
don't need to apply some kernel patches for the eq cost multipath to work? 
'coz if my memory serves, quagga or other routing daemons just 
insert/delete/update the route entries in the kernel, they do not take part 
in any packet routing decisions.


----- Original Message ----- 
From: "Nickolay Kritsky" <Nickolay.Kritsky at astra-sw.com>
To: "mc" <mc at netx.com.hk>; <freebsd-net at freebsd.org>
Sent: Wednesday, March 09, 2005 18:35
Subject: RE: multiple uplinks from ISP


Why can't you use dst-ip hashing? You are using /24 network for your client 
machines, no? If FEC uses IP addresses for hashing that you are ok. If it 
uses MAC addresses for hashing, you need to test something else.
Regarding your initial post here is my proposal:

fxp0: 1.2.3.1/30
fxp1: 1.2.3.5/30
em0: 10.123.123.102/24

Your ISP gives you 2 more /30 nets for your uplinks
You should have two default gateways on fxp0 and fxp1 (1.2.3.2 and 1.2.3.6 
respectively)
ISP AS should have two routes to your network with the same weight.

Problem: FreeBSD natively does not support two different routes to the same 
destination. AFAIK this is by design.
Solution: It can be solved using custom patch (I think I have seen such for 
4.x systems) or using external routing daemon like quagga.

Nick

-----Original Message-----
From: mc [mailto:mc at netx.com.hk]
Sent: Wednesday, March 09, 2005 1:06 PM
To: freebsd-net at freebsd.org
Subject: Re: multiple uplinks from ISP


Hi,

I am using cisco 29xx and 3xxx switches. The problem with FEC is that I have
no way to use dst-ip hashing as the load balancing option on these two
switches, and that would cause biased utilization on a certain link only,
i.e. impossible to utilize 2*100=200Mbps.

and...if I were really to use FEC as the solution, I will need to get some
much expensive switches from cisco, which is quite unaffordable and imho
unnecessary in fact...


----- Original Message ----- 
From: "Nickolay Kritsky" <Nickolay.Kritsky at astra-sw.com>
To: "mc" <mc at netx.com.hk>; <freebsd-net at freebsd.org>
Sent: Wednesday, March 09, 2005 17:58
Subject: RE: multiple uplinks from ISP


hello

I do not think you should mess a lot with interdomain routing here. Such a
scenario (multiple uplinks from the same ISP) IMHO is better be solved on
the layer 2.
What you need is some technology that utilizes two Ethernet ports at once.
About a week or two ago on this list was discussed similar setup using Cisco
technology. Search for subject "ng_fec and Cisco 2931". I f your ISP is
using the switch/router that supports FEC, you could do this trick. Also
most 3com intelligent switches support aggregating links via multiple
100Mbit channels. If you have put 3com equipment on both sides of your
internet connection you'll can get what you want.

Hope that helps.
BTW the first and best thing to do is to ask such question to your ISP.

Nick


-----Original Message-----
From: mc [mailto:mc at netx.com.hk]
Sent: Wednesday, March 09, 2005 12:32 PM
To: freebsd-net at freebsd.org
Subject: Re: multiple uplinks from ISP


Hi,

The main problem is that I have no idea at all how should I setup
everything..and what do I need from my ISP......I just know it was possible,
but I can't recall the details inside, and a simple google did not return
anything helpful to me.

I agree with you that fbsd (or any other linux) is much better than cisco in
terms of stability. The cisco routers at my site are crashing like cron jobs
while the fbsd boxes usually have long uptimes. :)

off topic: I used to be a network admin some time ago, but no longer true
now....and unfortunately, in the past I had only very few chances to deal
with interdomain routing, mainly in lab.
I'm afraid I have forgotten everything by now :(


----- Original Message ----- 
From: "Goran Gajic" <ggajic at mail.sbb.co.yu>
To: <freebsd-net at www.freebsd.org>
Sent: Wednesday, March 09, 2005 6:01
Subject: Re: multiple uplinks from ISP


>
> Hi,
>
> I have used succesfuly FBSD 5.2.1 as BGP router and it is rock stable with
> quagga (check out www.quagga.net) - more stable then 30k $ Cisco 7206 :))
> Problem is  if you have AS and LIR and if you don't there are other
> solutions. Of course much depends is your uplink ISP willing to cooperate.
>
> Regards,
> gg.
>
>
>
>> Hi all,
>>
>> If I have the following on hand...
>> - 2 FastEthernet uplinks from ISP
>> - 1 GigabitEthernet port on my switch
>> - a subset of a /24 allocated by ISP
>> The gigabit ethernet link should be connecting to my internal network.
>
> _______________________________________________
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> http://lists.freebsd.org/mailman/listinfo/freebsd-net
> To unsubscribe, send any mail to "freebsd-net-unsubscribe at freebsd.org"
>


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