multiple logical interfaces

[Jerry Jensen]

How can this be done programmatically rather than from
the command line?  Code snippets would be handy. 
Thanks


--- . at babolo.ru wrote:
> > Actually, what I want is the equivalent of this
> (which
> > is in Linux) on FreeBSD.  Note the ip address
> > associated with each of the logical interfaces
> > (lo:XX).
> And what?
> 0cicuta~(11)#ifconfig lo0
> lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu
> 16384
>         inet6 ::1 prefixlen 128 
>         inet6 fe80::1%lo0 prefixlen 64 scopeid 0x7 
>         inet 127.0.0.1 netmask 0xffffff00 
> 0cicuta~(12)#ifconfig lo1
> lo1: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu
> 16384
>         inet 127.0.1.1 netmask 0xffffff00 
>         inet 127.0.1.2 netmask 0xffffffff 
> 0cicuta~(13)#ifconfig lo2
> lo2: flags=8008<LOOPBACK,MULTICAST> mtu 16384
> 0cicuta~(14)#ifconfig lo3
> lo3: flags=8008<LOOPBACK,MULTICAST> mtu 16384
> 0cicuta~(15)#ifconfig lo3 192.168.0.1/24
> 0cicuta~(16)#ifconfig lo3
> lo3: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu
> 16384
>         inet 192.168.0.1 netmask 0xffffff00 
> 
> The only disadvantage in
> 0cicuta~(17)#uname -a
> FreeBSD cicuta.babolo.ru 4.9-RC FreeBSD 4.9-RC #0:
> Fri Oct 10 11:37:45 MSD 2003    
>
babolo at cicuta.babolo.ru:/tmp/babolo/usr/src/sys/cicuta
>  i386
> is that lo can't be created dynamically.
> 
> One more quection: why not alias the lo0 ?
> 
> > eth0      Link encap:Ethernet  HWaddr
> > 00:06:5B:19:55:EE  
> >           inet addr:10.2.1.122 
> Bcast:10.255.255.255 
> > Mask:255.0.0.0
> >           UP BROADCAST RUNNING MULTICAST  MTU:1500
> 
> > Metric:1
> >           RX packets:5903525 errors:0 dropped:0
> > overruns:0 frame:0
> >           TX packets:5337692 errors:0 dropped:0
> > overruns:0 carrier:0
> >           collisions:0 txqueuelen:1000 
> >           Interrupt:16 Base address:0xecc0
> > Memory:fe2ff000-fe2ff038 
> > 
> > eth1      Link encap:Ethernet  HWaddr
> > 00:06:5B:19:55:EF  
> >           inet addr:192.168.6.122 
> Bcast:192.168.6.255
> >  Mask:255.255.255.0
> >           UP BROADCAST RUNNING MULTICAST  MTU:1500
> 
> > Metric:1
> >           RX packets:1818518022 errors:2 dropped:0
> > overruns:263 frame:2
> >           TX packets:1182175968 errors:0 dropped:0
> > overruns:0 carrier:0
> >           collisions:0 txqueuelen:1000 
> >           Interrupt:17 Base address:0xec80
> > Memory:fe2fe000-fe2fe038 
> > 
> > lo        Link encap:Local Loopback  
> >           inet addr:127.0.0.1  Mask:255.0.0.0
> >           UP LOOPBACK RUNNING  MTU:16436  Metric:1
> >           RX packets:199 errors:0 dropped:0
> overruns:0
> > frame:0
> >           TX packets:199 errors:0 dropped:0
> overruns:0
> > carrier:0
> >           collisions:0 txqueuelen:0 
> > 
> > lo:10     Link encap:Local Loopback  
> >           inet addr:202.175.33.10 
> > Mask:255.255.255.255
> >           UP LOOPBACK RUNNING  MTU:16436  Metric:1
> > 
> > lo:11     Link encap:Local Loopback  
> >           inet addr:193.65.100.99 
> > Mask:255.255.255.255
> >           UP LOOPBACK RUNNING  MTU:16436  Metric:1
> > 
> > lo:12     Link encap:Local Loopback  
> >           inet addr:193.65.100.100 
> > Mask:255.255.255.255
> >           UP LOOPBACK RUNNING  MTU:16436  Metric:1
> > 
> > lo:13     Link encap:Local Loopback  
> >           inet addr:210.183.28.42 
> > Mask:255.255.255.255
> >           UP LOOPBACK RUNNING  MTU:16436  Metric:1
> > 
> > --- . at babolo.ru wrote:
> > > > is it possible in freebsd to have multiple
> logical
> > > > interfaces associated with say the loopback
> > > interface?
> > > >  if so, how does one do this programmatically
> (as
> > > > opposed to from the command line).
> > > > 
> > > > need this for building traffic generators that
> > > need to
> > > > simulate a bunch of different ip sources. 
> solaris
> > > > allows it as does linux i believe. 
> > > > thx.
> > > Is it what you want?
> > > 
> > > > ifconfig -a | grep lo
> > > lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST>
> mtu
> > > 16384
> > >         inet6 fe80::1%lo0 prefixlen 64 scopeid
> 0xa 
> > > lo1: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST>
> mtu
> > > 16384
> > > lo2: flags=8008<LOOPBACK,MULTICAST> mtu 16384
> > > lo3: flags=8008<LOOPBACK,MULTICAST> mtu 16384
> > > 
> > > If it is, there is from kernel config:
> > > 
> > > > grep loop /sys/i386/conf/garkin 
> > > pseudo-device   loop    4       # Network
> loopback
> > > 
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