When you connect to a real network on a host with multiple network interfaces installed, Simics will select one of them for the real network connection. If the default selection is incorrect, you can use the interface argument of the command you use to connect to select the desired interface.
The interface name expected by the interface argument is the ordinary interface name used by the host operating system. You can list all network interfaces by running /sbin/ifconfig -a on the simulation host:
joe@computer$ /sbin/ifconfig -a
eth0 Link encap:Ethernet HWaddr 00:10:18:0A:DE:EF
BROADCAST 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:1000
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
Interrupt:21
eth1 Link encap:Ethernet HWaddr 00:0C:F1:D1:FF:09
inet addr:10.0.0.140 Bcast:10.0.0.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:671467287 errors:0 dropped:0 overruns:0 frame:0
TX packets:647635204 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:3725791210 (3553.1 Mb) TX bytes:217046405 (206.9 Mb)
Interrupt:20 Base address:0xdf40 Memory:fceef000-fceef038
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:24929 errors:0 dropped:0 overruns:0 frame:0
TX packets:24929 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:4164218 (3.9 Mb) TX bytes:4164218 (3.9 Mb)
For example, to use the first interface listed above you would specify eth0 as the interface argument.