SuSEfirewall 4.3-3 and dial-up connections

hi, I installed the SuSEfirewall 4.3-3 and set it up with an ISDN card as ext. device. On startup, the firewall protects the given ip (192.168.0.1). When I dial in (kinternet) no connections can be made. So I added /etc/ip-up.local witch includes: /sbin/SuSEfirewall2 start now everything works. Is it ok or may I get get into trouble? Thanx Thorsten