Description of problem: After updating to kernel 2.4.20-28.9, iptables works erratically. Certain filters does not work, DNAT does not work, LOG on INPUT does no work. Only default policies seems to work. Stock kernel 2.4.20-8 work OK; haven't tried other releases. Version-Release number of selected component (if applicable): kernel-2.4.20-28.9 iptables-1.2.7a-2 How reproducible: Always. Steps to Reproduce: 1. set a rule for filter/INPUT to LOG packets at a exterior interface 2. set a rule for nat/DNAT to a internal machine, any protocol/service 3. set a rule for filter/FORWARD to match the nat/DNAT rule from (2) 4. set the default policy for filter/FORWARD to DROP 5. try a connection from exterior network, follow with tcpdump Actual results: No LOG; No connection. tcpdump only shows packets arriving at the external interface, no one left to the internal machine. Expected results: Log of packet activity Connection from exterior with internal machine tcpdump shows communication exchange Additional info: Sometimes, something works; I get logs, mostly from filter/FORWARD chain. This is a MAJOR security bug; anyone with an ACCEPT security policy may be vulnerable.
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