Berkeley CSUA MOTD:Entry 18846
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2025/05/28 [General] UID:1000 Activity:popular
5/28    

2000/8/2-4 [Computer/SW/OS/Linux, Computer/SW/OS/Solaris] UID:18846 Activity:high
8/1     I set up IP masquerading and it works for my intranet...
        but do I need two NIC's to get it to also connect to the Internet?
        \_ You do need two network interfaces.  they dont _necessarily_
           have to be two separate physical nics, but its recommended.
           \_ Logically interfaces can put a lot of load on your system
           \_ Logical interfaces can put a lot of load on your system
              depending on how other systems are connected to it.
              \_ This is only for a week or two before my stupid ISP assigns
                 me more IP addresses. How do I create logical interfaces?
                 "route"? Pointer to a FAQ would be great.
                  \_ Its something like ifconfig <int>:<num>. man ifconfig
                     on your system. ----ranga
                     \_ are you sure? Ifconfig seems to be for configuring
                        existing network interfaces? I don't see anything
                        relating to that in the ifconfig manpage
                        "Ifconfig is used to configure the kernel-resident
                        network interfaces."
                        \_ AFAIK, the following creates a logical interface
                           on Linux:

                           # ifconfig eth0:1 aaa.bbb.ccc.ddd

                           where aaa.bbb.ccc.ddd is the IP address. Its
                           similar on Solaris:

                           # ifconfig hme0:1 aaa.bbb.ccc.ddd up

                           Don't have a Solaris machine handy to try it.
                           ---ranga
                           \_
                             ifconfig eth0:1 1.2.3.4
                             SIOCSIFADDR: No such device
                             SIOCSIFFLAGS: No such device
                             \_ You must have CONFIG_IP_ALIAS enabled
                                (compiled or loaded) in the kernel. --Galen
                                \_ Thanks.
                             \_ Is eth0 even the name of this person's NIC?
                                \_ Yes.
        \_ Summary: 1) Use this syntax: "ifconfig eth0:0 10.1.1.1 up",
           replacing eth0 with the obvious, on Linux or Sun. 2) On linux, you
           need CONFIG_IP_ALIAS in the kernel. 3) You are really much better
           off with a real second network card. --Galen
        \_ Summary: 1) To create a virtual interface use this syntax:
           "ifconfig eth0:0 10.1.1.1 up", replacing eth0 with the obvious, on
           Linux or Sun. 2) On linux, you need CONFIG_IP_ALIAS in the kernel.
           3) You are really much better off with a real second network card.
           --Galen
           \_ wrong name. If you do that on sun, you get the "real" if.
              get into the habit of using eth0:1
2025/05/28 [General] UID:1000 Activity:popular
5/28    

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