How to monitor network traffic on an IP alias?

Does anybody happen to know how I can monitor the traffic on an IP alias on say igb0:1 using iftop or something similar? iftop (pcap, I guess is the issue here) doesn't seem to cope with IP aliases.
Cheers

After fiddling around a bit with this issue I decided that it was time to embrace dladm/ipadm a bit more and exchange these old-style virtual NICs with new ones. So I dumped the old igbx:y VNICs and created new ones by issuing:
dladm create-vnic -l igb0 vnic0
followed by:
ipadm create-ip; ipadm create-addr…
Now, I can monitor these new vnics using if top just fine.

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