ppp with dynamic IPs and ipfw "me"
nakal at web.de
Wed Jun 16 16:42:01 GMT 2004
I've a strange effect here when using "ppp -ddial" with my
ISP and my firewall rules.
Sometimes, I get disconnected with my DSL router and ppp
reconnects me in background. This is correct so far, but
I also get a new (dynamic) IP and it seems that ipfw
does not forget my old IP.
I noticed this behavior with the rules which restrict
the communication to the ntpd-port 123.
The rules look like this:
allow udp from xx.xx.xx.xx 123 to me dst-port 123
allow udp from me 123 to xx.xx.xx.xx dst-port 123
After I get a new IP, the logs show that the communication
from "me" to xx.xx.xx.xx is blocked.
I'm on DSL here (using PPPoE and NAT).
Is this a bug or should I update the rules myself?
If yes, what is the best way to update the rules?
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