Here is my original post...... == I have a dual processor E420R with a Quad Fast Ethernet card. I am using two interfaces on == the card and have two aliases set up on the first interface. They look like... == == qfe0 167.242.23.44 == qfe0:1 167.242.23.63 == qfe0:2 167.242.23.63 == qfe3 167.242.159.5 == == I have been asked to create yet another alias on qfe0 (qfe0:3) but I am concerned about == doing this. Is there anything I should be worried about? Is there a limit to the number == of aliases on a port? Fortunately the traffic on the aliases is very minimal so this == is not a concern. Thanks to everyone who responded. Doug Otto... You can have up to 255 Ips per interface....no worries Ed Rolison... Virtual hosts (hme0:<xx>) I've not had a problem with. For quite a while I was running a HTTP/1.0 server which for historical reasons had 50 or so separate IP addresses on virtual interfaces. No real problems with doing this. (I've not done it on qfe, but I see no reason why this should differ. The other slight caveat is that outgoing traffic _may_ seem to be coming from an arbitrary interface if you have multiple on the same subnet) Dave McNeill... Adrian Cockroft in 'Sun Performance and Tuning' (Sun Microsystems Press): 'Up to about 8,000 addresses on a single interface have been tested.' I guess this means that another one won't hurt you! Ozgur C. Demir... You can create 255 instances on one interface unless you raise the limit by setting kernel parameter, i dont remember the name of this parameter but if you need i can find. So, you need to calculate the traffic on each instance to get the result if you will have a bottleneck or not, it is completely up to traffic. Jonathan A. Zdziarski... The default number of aliases is 256. By setting ip_addrs_per_if, you can bring this level up to 8192. There is no real danger in adding more interfaces, but if you raise the total number of allowable aliases by setting ip_addrs_per_if to a higher number, there may be a negative performance impact on TCP/IP. http://docs.sun.com:80/ab2/coll.780.2/SOLTUNEPARAMREF/@Ab2PageView/10497?Dwe bQuery=kernel+OR+tunables&oqt=kernel+tunables&Ab2Lang=C&Ab2Enc=iso-8859-1 _______________________________________________ sunmanagers mailing list sunmanagers@sunmanagers.org http://www.sunmanagers.org/mailman/listinfo/sunmanagersReceived on Tue Jan 29 12:23:25 2002
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