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Date:      Sat, 17 Feb 2001 23:04:27 -0600
From:      Michael Schoensee <michael@tuxcom.net.mx>
To:        questions@freebsd.org
Subject:   natd -reverse
Message-ID:  <3A8F57DB.E75B7AA2@tuxcom.net.mx>

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Can't bring natd to work in the "internal" interface.

Have to run the natd on the internal interface.

Scenario:

PC1              pc2                                      
PC3               
10.10.14.13/24===10.10.14.254/24(rl1) 10.0.0.214/24(rl0)===10.0.0.254
gw 10.10.14.254              gw 10.0.0.254                 route
10.10.14.0/24 10.0.0.214 

Ping from PC3 to 10.10.14.254 ok
          PC3 to 10.10.14.13  ok
Ping from PC1 to any interface ok

So adding in pc2:
   ipfw add 300 divert 8668 ip from any to any via rl1
       /root # ipfw show
       00100   7830   313200 allow ip from any to any via lo0
       00200     22      968 deny ip from any to 127.0.0.0/8
       00300      8      672 divert 8668 ip from any to any via rl1
       65535 107693 17501832 allow ip from any to any

   and
   natd -v -i rl1 -reverse
       natd[1316]: Aliasing to 10.10.14.254, mtu 1500 bytes
       In  [ICMP] [ICMP] 10.10.14.13 -> 10.0.0.254 8(0) aliased to
           [ICMP] 10.10.14.254 -> 10.0.0.254 8(0)
       In  [ICMP] [ICMP] 10.10.14.13 -> 10.0.0.254 8(0) aliased to
           [ICMP] 10.10.14.254 -> 10.0.0.254 8(0)         
 
No Packets are coming back.
But:
         natd -v -n rl1
         natd[1321]: Aliasing to 10.10.14.254, mtu 1500 bytes
         In  [ICMP] [ICMP] 10.10.14.13 -> 10.0.0.254 8(0) aliased to
             [ICMP] 10.10.14.13 -> 10.0.0.254 8(0)
         Out [ICMP] [ICMP] 10.0.0.254 -> 10.10.14.13 0(0) aliased to
             [ICMP] 10.0.0.254 -> 10.10.14.13 0(0)               

Natd leave the packets untouched and can ping from PC3 to PC1 and PC1 to
PC3


How to analyze?
Tried tcpdump.
What I am missing?


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