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Date: Sun, 29 Jan 2012 03:41:27 +0100 From: Eric Dumazet <eric.dumazet@...il.com> To: Simon Chen <simonchennj@...il.com> Cc: netdev@...r.kernel.org Subject: Re: increase the number of routing tables Le samedi 28 janvier 2012 à 21:20 -0500, Simon Chen a écrit : > Hey folks, > > To my limited knowledge, Linux currently supports 256 (255?) routing > tables defined in /etc/iproute2/rt_tables. > > Is there a way to increase this number to something much larger? Are > there performance/scalability concerns there? I am trying to have > customized routing table for each IP address (using "ip rule add from > xxx table yyy"). I am not sure exactly how many IPs I'll handle, but > certainly more than 255... > Its is possible, but probably not scalable. You really should not have too many "ip rule" entries, since they are evaluated linearly. The limit being ~32768 rules # ip rule 0: from all lookup local 32763: from all to 1.2.3.7 lookup test3000 32766: from all lookup main 32767: from all lookup default # cat /etc/iproute2/rt_tables # # reserved values # 255 local 254 main 253 default 0 unspec # # local # #1 inr.ruhep 3000 test3000 # ip route list table 3000 1.2.3.4 dev eth0 scope link -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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