Hot Diggety! Yves Dorfsman was rumored to have written: > > Anybody with a lot of experience with Linux bonding setup in arp > request mode?
Sadly, I have to disclaim up front that no, I do not. But I do have a few comments. :) > -What is a reasonable value for arp_interval? You obviously want a > value small enough that the connection fails over before it affects > applications, but not too small that it will flood the network. The > documentation shows examples with a value of 60 ms, but googling, it > seems that a lot of people use 200ms and even 500ms. How do you pick a > value? Is there a science to it, or is it more of a guest work? I would have to guess likely on basis of an initial guess then some trial and error experimentation. If people are using 200ms or higher, it is possible they are doing so because they've gotten burned by odd switch issues involving brief periods of being in a coma. Only a guess, though. In general, I would think most applications could be reasonably tolerant of even a brief one-time 200ms pause. 500ms might be pushing it, though. > -how do you administer the list of arp_ip_target? I am afraid that > regardless of how we document it and how much we talk about it today, > eventually, in a few years from now, the machines from the list will > be decommissioned and nobody will remember to change the arp_ip_target > on all the other machines in that subnet... More an organizational and process issue than technical, I would think. > -It seems that some routers do not reply to pings to themselves when > they get busy (under heavy load). That's indeed correct. This is configurable, but is a common default. Though, in actual practice, I'm not sure I've seen pings dropped on edge routers. Core routers, certainly, but devices are often connected to switches that then connects to edge routers where the load is lower. -Dan _______________________________________________ Tech mailing list Tech@lists.lopsa.org https://lists.lopsa.org/cgi-bin/mailman/listinfo/tech This list provided by the League of Professional System Administrators http://lopsa.org/
