Adding and additional IP address, does it affect SuSE firewall?

I am running a single Internet-facing application server on SLES 8 for AMD64. We have the SuSE firewall configuration enabled and all appears protected well when we do nmap scans. We need to add an additional IP address to provide an additional SSL certificate on a different Apache2 virtual host. Two questions: 1) Does this affect our firewall configuration? I could not find any references in the configuration pages to this. 2) Should I use the ip-alias facility for doing this? I found mention on one post that since kernel 2.4 this facility has been superceded by features in the firewall. Not sure how, nor could I find any hints. Thank you - Richard