Hi all,

Firstly many thanks to all your help! And sorry for late reply...

>  > With these settings, My FBSD host can NOT even dial out to ISP. :-(
>  > Please anybody tell me, what I do wrong here.
> 
>  > At this time I must go back to the original setting in order to dial ISP.
>  > And lastly I'm sorry for long questions.
I didn't touch /etc/ppp/ppp.conf, which has been working for 5 years since 
FBSD5.0R. Even if I go back to GENERIC kernel. I could not dial out to ISP in 
any ways. I didn't know what I do wrong even if I did read many docs. Yesterday 
I decided to re-install FBSD7.0R from CDs again. That causes late reply, I'm 
sorry. :-(

I now have gateway_enable="YES" and firewall_enable="YES" in my /etc/rc.conf.
I can then dial ISP again. Then the following steps were taken.

1. I can ping any sites and very fast.
2. # kldload ipfw (as I don't want to compile kernel anymore.)
3. # kldload ipdivert
4. I also have ``natd    8668/divert'' in my /etc/services.
5. # natd -interface tun0
6. # /sbin/ipfw add 101 divert natd all from any to any via tun0
7. # /sbin/ipfw add 102 pass all from any to any
(Note that my first ipfw rule is 100 check-state. So steps 6 and 7 should be 
considered as the first two filtering rules.)

I do this way because I know from reading document that ppp must be run before 
natd. I always want to dial ppp by myself so I can't put natd in /etc/rc.conf. 
And doing it interactively is very easy to detect when something goes wrong and 
step 1 can proof my good connection.
After step 7 I switched to terminal, which keeping ping. I found that ping 
stalled. I tried re-connect many times, now I know that step 3 causes the 
problem. I have also tried putting ipfw_load="YES" and ipdivert_load="YES" in 
/boot/loader.conf. The problem persists. I'm quite sure that the module 
ipdivert has adverse effect to the connection through modem. Should I say a 
bug?!!! Without ipdivert I can not play NAT (I don't want to learn ``ipfw nat'' 
and ``ppp -nat'' for now). This was also the major problem when I recompiled 
kernel with options IPDIVERT few days ago. That caused me unable to connect 
ISP. One thing I should note here, always run ppp before natd. Last time when I 
was on GENERIC kernel, I couldn't connect ISP because my /etc/rc.conf contained 
natd. So natd ran before ppp, which was run manually. That was wrong.
Anyone has a clue please point me to the right direction.
I would probably go back to external router gateway ``out of the box''.
For now I give up and need to rest.

Thank you.
Pongthep
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