A Challenge... NAT for PPP dial in user

[Drew Robertson]

Hey all,

I've been playing around with this for a while.

I have a FreeBSD 4.8 box set as a gateway on my home LAN.  I have 1 pc 
downstairs, and a few dial up users... FreeBSD box has 2 network cards, 1 
for internal, 1 for external internet using cable & 1 56k modem.

Very simple problem... when a dial in user connects to the FreeBSD 
gateway/router using PPP, NAT stops working on the PC downstairs and won't 
work on the dial in PC either...

I have complete LAN access (telnet, ssh, samba, ping etc) on both the dial 
in PC and the downstairs PC, but somewhere my config is preventing everyone 
from being able to access the internet at once.

In rc.conf, I have my Gateway_enable=YES, defaultrouter=192.168.1.1, 
router_enable=yes, proxyarp_all=yes...

PPP.conf is simple...

  enable pap
  enable passwdauth
  set ifaddr 192.168.1.1 192.168.1.100-192.168.1.199 255.255.255.0
  add HISADDR 255.255.255.0 MYADDR
  accept dns
  set dns 203.2.75.132
  enable proxy

In natd.conf

interface tl0
sameports yes
dynamic yes

I'm running a firewall, but it is open for the TUN0 interface...

I also have a divert natd (8668) allow all from any to any out via tl0

All other PC's on the LAN are windows clients... the one downstairs I was 
able to just set a default gateway and it was up and running on the 
internet, unfortunately it isn't done like that on a dial in setup on 
windows...  I can't use DHCP for the clients, as I'm not supposed to have 
internet sharing running...

Do I need to have an add statement in the PPP.conf, or do i have to enable 
proxyall rather than enable proxy??

Worst thing about this is I can't find enough doco on it on the net... I'll 
write my own when I get it done...


Thanks


D

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