Hi, > ip route add default scope global ["equalize"] nexthop dev ppp0 weight 1 \ > nexthop dev ppp2 weight 1 \ > nexthop dev ppp3 weight 1 \ > nexthop dev ppp4 weight 1 This is exactely the setup i'm running including the "equalize" keyword. I'm combining this with NAT which as i said in previous emails it is not load balancing my traffic. So, this seems to answer your question about NAT playing well with this iproute setup. I read the documentation about NAT in IPROUTE (http://snafu.freedom.org/linux2.2/docs/ip-cref/ip-cref.html) and it mentions that NAT is only avalable for kernels 2.2.x .... am i right?????? Thanx.... X > You can even do per packet routing ("equalize" keyword should do) > which is not recommended while combining with nat. However, I don't > know whether conntrack/nat in netfilter plays well with this or not. > But even if not, you still can use the "nat" capability of iproute2 itself. > > Let us know if it worked. > > Ramin > > On Thu, Jul 17, 2003 at 04:29:31PM -0400, Javier Govea wrote: > > > I undesrtand what you mean about perfect load balancing (i'm not actually looking for a > > perfect load balancer) I have two examples below, but first i will responde some of the > > questions. > > > > > Do these two ppp accounts belong to the same ISP? > > Yes. I have four accounts, all of them with the same ISP > > >Does the ISP drop forign src? > > ????? > > > Is the gateway doing nat? > > Yes, im using iptables to setup the nat > > > Do you have any preference on one of the ppp's than the other? > > No > > >Can you bond (mppp)? > > I haven't tried multilink ppp...i will look into this... > > > > > You could also setup something like BGP to allow multiple routes to.... > > I don't know if this would be the best approach. I already tried to setup BGP and OSPF > > routes using zebra (<a href='http://zebra.org'>http://zebra.org</a>) and i never made it work.... > > I found a tool called EQLPlus (<a href='http://www.cwareco.com/download/eqlplus.html'>http://www.cwareco.com/download/eqlplus.html</a>) but i was > > never able to compile it. Has anybody has tried eqlplus before??????? > > > > > If one user makes a request out of line X then the return packet HAS to come back > > > through line X. So, if one guy sends a huge request taking minutes to fulfill, he / she > > > will tie up the line until the job is finished > > > > Absolutely. I can live with that, but here is my problem. I have 4 ppp links on my router > > (which is doing nat). Then if in a host, located in my LAN which connected to my router, i > > open four browsers and each browser is pointing to the same site then i'm expepecting each > > web page to be requested and returned in a different link. But that doesn't happen. Some > > times it does happen but most of the time i get three of the responses on one link, one in > > another and the other two links do nothing. Sometimes i get 2,1,1,0 .... > > > > I did another test...i have website with has in its main web page has only 4 images > > (differnt images but all of them of exactely the same size). if i point my browser to that > > site, then i'm believe the browser is sending four http requests (one for each image), > > well i would expect one image on each link....but again sometimes i get the four images on > > the same link...some times i get 2 images in one link... > > > > So, i don't want a perfect load balancer but i would like to fix the problems on my two > > examples... i thought about implementing a round robin algorithm for load balancing where > > my first request goes on my first available link, the second one on the second available > > link and so on....this idea fixes my problems in my two previous examples, but i'm open to > > suggestions.... > > > > any tips, pointer, ideas are all welcome... > > > > cheers... > > X > > > > > > > > > Absolutely. Perfect load balancing needs to be coordinated on _all_ the > > > endpoints of the links involved. In this case, 4 endpoints. > > > > > > For a regular load balancing (which is going to be the case here) > > > we still have lots of unknown variables. Do these two ppp > > > accounts belong to the same ISP? Does the ISP drop forign src? > > > Is the gateway doing nat? Do you have any preference on one of > > > the ppp's than the other? Can you bond (mppp)? And so on. > > > But a fun project, though, for someone who has time... > > > > > > Ramin > > > > > > On Tue, Jul 15, 2003 at 12:44:40PM -0700, Daniel Chemko wrote: > > > > > > > Because of the nature of your setup, you cannot have a perfect equal > > > > load balance setup. This is because you cannot control the inbound flow > > > > of data. If one user makes a request out of line X then the return > > > > packet HAS to come back through line X. So, if one guy sends a huge > > > > request taking minutes to fulfill, he / she will tie up the line until > > > > the job is finished. The load balancer should be smart enough to not > > > > send any more requests to that line, but you are still seeing the line > > > > being monopolized by this single connection, hence it is not balanced > > > > over all lines equally. > > > > > > > > In order to have fair balancing of all lines, I think you need to set up > > > > a deal with your ISP to load balance on their end as well. > > > > > > > > You could also setup something like BGP to allow multiple routes to the > > > > same return address, but I am not familiar enough with BGP to be much > > > > help in this area. In all likelihood, you are better off with your > > > > current solution or maybe the ISP solution if it is supported by them > > > > (more money usually). > > > > > > > > > > > > > > > > -----Original Message----- > > > > From: Javier Govea [mailto:jgovea@xxxxxxxx] > > > > Sent: Tuesday, July 15, 2003 12:34 PM > > > > To: netfilter@xxxxxxxxxxxxxxxxxxx > > > > Subject: Round Robin Load Balancing > > > > > > > > Hi, > > > > > > > > I'm trying to do some load balancing with four ppp connections. Here is > > > > what i have: a LAN > > > > connected to a redhat box which has four ppp interfaces. All the boxes > > > > in the LAN are > > > > accesing internet through the ppp interfaces in the redhat box. I'm > > > > using iproute2, in my > > > > redhat box, to setup the the four ppp interfaces as my default out going > > > > route (as > > > > described in LART <a > > href='<a href='http://lartc.org/howto/index.html'><a href='http://lartc.org/howto/index.html</a>'>http://lartc.org/howto/index.html</a></a>'>http://lartc.org/howto/index.html'><a href='http://lartc.org/howto/index.html</a>'>http://lartc.org/howto/index.html</a></a></a>) and I'm using > > > > iptables to masquerade > > > > all the traffic comming from the LAN. > > > > > > > > My setup is working fine, ie. my LAN can access the net throught the > > > > four ppp interfaces. > > > > My problem is that i don't know how is the load balancing working. Some > > > > times one of the > > > > ppp interfaces is used more than the others (and that is my problem). > > > > According to LART > > > > the routes are cached, can someone go a bit into more details in this > > > > caching thing??? how > > > > does it work? which particular files in the kernel are doing this? > > > > > > > > I would like to implement a simple round robing algorithm (with no > > > > caching) for doing the > > > > laod balancing. That is first connection established gose through ppp0, > > > > the second > > > > connection on ppp1 and so on. > > > > > > > > I could hack iproute2 and/or iptables, but i'm not sure about which > > > > particular files i > > > > should hack in order to implement this round robin algorithm. I actually > > > > don't know if > > > > what i want makes any sense > > > > > > > > Any ideas or pointers are all very well appreaciated. > > > > Thanx to all > > > > X > > > > > > > > > > > > >
