Iptables-Redirect

Hi all, imagine a server (SuSE 7.3) at a school with diskless clients (etherboot/ltsp) working on it. Internet via ippp0, ibod, iptables, SuSEFirewall2 2.0, junkbuster (Port 1234) [to keep the kids away from 'junk'] chained to squid (Port 5678). Clients connected via eth0. Idea is not to allow direct http access for eth0 and local accounts, all this traffic has to run through the proxy chain. Redirect-Rule in firewall2.rc.config: FW_REDIRECT="0/0,0/0,tcp,80,1234" The traffic gets not redirected, no log entries about redirect. The same thing worked on 7.0 with ipchains and firewall 1.7. Any ideas ? Thanks in advance -- Thomas Götz