subnets are a IP (layer 3) thing, a switch operates at layer 2. the switch only cares about the MAC (layer 2) address. you can have lots of different subnets running through a layer 2 switch, but you won't be able to communicate between subnets without routing (at layer 3) between them.
jason On Wednesday 18 June 2003 13:56, lfwelty wrote: > How do the virtual interfaces work w/ different subnets if you are > connected via the same physical interface? > > ie. Do you have to be plugged into a switch that can handle different > subnets on the same interface? > > Jason Tower wrote: > > what you are describing is a virtual interface, and it's a snap. for a > > quick and dirty setup, you can simply run the following: > > > > [EMAIL PROTECTED] root]# ifconfig eth0:0 10.1.1.1 > > > > which results in something like the following: > > > > [EMAIL PROTECTED] root]# ifconfig > > eth0 Link encap:Ethernet HWaddr 00:A0:C9:5A:DF:F7 > > inet addr:10.0.0.100 Bcast:10.0.0.255 Mask:255.255.255.0 > > UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 > > RX packets:454545 errors:0 dropped:0 overruns:0 frame:0 > > TX packets:311037 errors:0 dropped:0 overruns:0 carrier:0 > > collisions:0 txqueuelen:100 > > RX bytes:94017376 (89.6 Mb) TX bytes:31798276 (30.3 Mb) > > Interrupt:10 Base address:0xdc00 Memory:ef201000-ef201038 > > > > eth0:0 Link encap:Ethernet HWaddr 00:A0:C9:5A:DF:F7 > > inet addr:10.1.1.1 Bcast:10.1.1.255 Mask:255.255.255.0 > > UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 > > RX packets:0 errors:0 dropped:0 overruns:0 frame:0 > > TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 > > collisions:0 txqueuelen:100 > > RX bytes:0 (0.0 b) TX bytes:0 (0.0 b) > > Interrupt:10 Base address:0xdc00 Memory:ef201000-ef201038 > > > > to make this permanent, copy /etc/sysconfig/network-scripts/ifcfg-eth0 to > > ifcfg-eth0:0 and modify the file contents with the desired info. you can > > have several virtual interfaces, all on different subnets. good luck! > > > > jason > > > > On Wednesday 18 June 2003 13:29, Michael Winslow Czeiszperger wrote: > >>Hi-- > >> > >>I'm working on a new feature for our load testing product and have been > >>stumped on a Linux configuration issue. The product needs to send out > >>HTTP requests from multiple IP addresses in order to fake out IP-based > >>load balancers. To do this I need to configure a Linux box to have > >>multiple IP addresses on the same network card, but for the life of me > >>I can't find the HOWTO or docs to do this. Strangely enough it seemed > >>fairly easy on Windows :-( > >> > >>Any pointers to the right documentation would be greatly appreciated... > >> > >>Thanks, > >> > >>-------------------------------- > >>Michael Czeiszperger > >>czei at webperformanceinc dot com > >>Web Performance, Inc. > >>9207 Baileywick Road, Suite 203 > >>Raleigh, NC 27615 > >>919-845-7601 > >> > >>_______________________________________________ > >>TriLUG mailing list > >> http://www.trilug.org/mailman/listinfo/trilug > >>TriLUG Organizational FAQ: > >> http://www.trilug.org/faq/TriLUG-faq.html > > > > _______________________________________________ > > TriLUG mailing list > > http://www.trilug.org/mailman/listinfo/trilug > > TriLUG Organizational FAQ: > > http://www.trilug.org/faq/TriLUG-faq.html _______________________________________________ TriLUG mailing list http://www.trilug.org/mailman/listinfo/trilug TriLUG Organizational FAQ: http://www.trilug.org/faq/TriLUG-faq.html
