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Joined: Fri May 28, 2004 3:26 pm
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Two or more failover and load balancing systems.

Tue Dec 21, 2004 5:57 pm

Hi guys.

I have a few hundred customers connecting to my backbone servers and authenticating with PPPoE. All the connections from the WLAN nodes create lots of traffic and I would like to load balance my servers.
I would like one of them to take over after the first one reached 300 users.
Is that possible?
I would also create a load balancing system. When the main server is down, the second one will take over it after say 10 seconds of registered inactivity from the server.
How could that be done ?
My users get official IP's handed out from the pool by my radius server (dynamically delegated or static).
The pools are defined in the RouterOS.
All the IPs from the pools are routed to my #1 PPPoE server (NAS1),

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Joined: Sun Jun 06, 2004 2:38 pm

Tue Dec 28, 2004 10:22 am

Ditto here

Quick answer:- when PPPoE server #1 hits 300 custys, I doubt there is a reliable way to make PPPoE server #2 start taking the remainder. You could probably do it with some tricko scripts however it'll be messy.

Long answer:-
We've noticed after 200+ PPPoE users, MT sometimes becomes unstable.
PPPoE servers run happily in parrallel (or 6 running together in our case) and as a rule of thumb will 'generally' load balance themselves.

Rembember PPPoE is layer 2 and you *shouldnt* have an IP on the PPPoE server interface for security reasons.

For redundancy you simply run them all on the same VLAN or layer 2 segment. The first PPPoE Server to reply to a CPE PPPoE login request will get the job for the duration of that session as long as the serice name set in the CPE is blank. If that PPPoE Server (concentrator) dies, the clients connected to that PPPoE server will automatically broadcast for another server to login to, then the next 'first one' to reply will get the job....

***off the beaten track but helpful info***
If your CPE's are any good, the above process all happens very quickly, ie 1 or 2 secs. Cisco's, M0n0wall's, and *many* Linksys CPE's are good. (Believe it or not, our testing has proved that all versions of MT have the worst PPPoE client ever seen. It will NEVER login again by itself unless its rebooted or the watchdog forces it to reboot... :-)
M0n0wall has the most reliable/fastest PPPoE client seen to date.
Dont bother if your CPE's comprise of too many MT's !

Out of 6 x MT boxes running a PPPoE server in parrallel, 9 times out of 10 we see the same amount of customers logged into each box.

Hint:- dont forget you need to run a dynamic routing protocol upstream of your 'parrellel' PPPoE servers, or proxy arp if your feeling lazy :-)

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