INCOMPATIBILITIES revision 4008138e2b5248940265b160fae001d8954fae21 
1INCOMPATIBILITIES:
2
3- The REJECT target has an '--reject-with admin-prohib' option which used
4  with kernels that do not support it, will result in a plain DROP instead
5  of REJECT.  Use with caution.
6  Kernels that do support it:
7  	2.4 - since 2.4.22-pre9
8	2.6 - all
9
10- There are some issues related to upgrading from 1.2.x to 1.3.x on a system
11  with dynamic ruleset changes during runtime. (Please see 
12  https://bugzilla.netfilter.org/bugzilla/show_bug.cgi?id=334).
13  After upgrading from 1.2 to 1.3, it suggest go do an iptables-save, then
14  iptables-restore to ensure your dynamic rule changes continue to work.
15