Memo to self, may help other folks.
Oct. 20th, 2005 07:19 am![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png){kind=small}
dsrtaoWhen debugging a complex process that is highly sensitive to initial conditions, you must start from the same initial conditions each iteration.
Practical example: the Linux Netfilter firewalling system is a thing of amazing power and flexibility. It will also happily hide information that you don't ask for. `iptables -L -n -v` lists only the MAIN firewall table -- if you have done anything with NAT, you must also examine the NAT table, and remember to flush it separately.
Practical example: the Linux Netfilter firewalling system is a thing of amazing power and flexibility. It will also happily hide information that you don't ask for. `iptables -L -n -v` lists only the MAIN firewall table -- if you have done anything with NAT, you must also examine the NAT table, and remember to flush it separately.
