ppp with dynamic IPs and ipfw "me"

[Don Lewis]

On 17 Jun, Brad Knowles wrote:
> At 11:36 AM +0200 2004-06-17, Oliver Fromme wrote:
> 
>>  I'm not sure if this is related to your problem, but you
>>  have to kill and restart ntpd every time you get a new IP.
>>  That's because ntpd binds to every IP address it finds upon
>>  startup explicitely, not just to "*".
> 
> 	BIND does the same thing.  If you're using UDP communications, 
> you almost always need to make sure that you send the response packet 
> on the same interface that you got the query from, and it's not 
> possible to tell which interface a packet comes in on if you just 
> listen to INADDR_ANY.

We should encourage the the appropriate parties to use the
IP_SENDSRCADDR feature (see ip(4)) in the FreeBSD ports of their
software.