NAT FreeBSD

FreeBSD NAT

ipnat

/etc/ipnat.rules

# Filename: /etc/ipnat.rules
#172.16.4.0/24 Internal backbone network on Mercantec
map em1 from 192.168.22.0/24 to 172.16.4.0/24 -> 172.16.4.7/32
#172.16.67.0/24 Printers on Mercantec
map em1 from 192.168.22.0/24 to 172.16.67.0/24 -> 172.16.4.7/32
#192.168.128.0/17 TEKKOM classes
map em1 from 192.168.22.0/24 to 192.168.128.0/17 -> 172.16.4.7/32
map vr1 192.168.22.0/24 -> 0/32
map vr1 172.21.0.0/16 -> 0/32
rdr vr1 83.90.239.186/32 -> 192.168.22.221  #sun
rdr vr1 83.90.239.187/32 -> 192.168.22.178  #Cisco
rdr vr1 83.90.239.188/32 -> 192.168.22.223  #bsd

/etc/rc.conf

Add the following to /etc/rc.conf

defaultrouter="83.90.47.29"
static_routes="backbone tekkom printers"
route_tekkom="-net 192.168.128.0/17 172.16.4.1"
route_backbone="-net 172.16.4.0/24 172.16.4.1"
route_printers="-net 172.16.67.0/24 172.16.4.1"

Checking ipnat

You can use ipnat -l to see active sessions and filters in use. Use ipnat -lv to see traffic from each session

[root@mars etc]#ipnat -l
List of active MAP/Redirect filters:
map em1 from 192.168.22.0/24 to 172.16.4.0/24 -> 172.16.4.7/32
map em1 from 192.168.22.0/24 to 172.16.67.0/24 -> 172.16.4.7/32
map em1 from 192.168.22.0/24 to 192.168.128.0/17 -> 172.16.4.7/32
map vr1 192.168.22.0/24 -> 0.0.0.0/32
map vr1 172.21.0.0/16 -> 0.0.0.0/32
rdr vr1 83.90.239.186/32 -> 192.168.22.221 ip
rdr vr1 83.90.239.187/32 -> 192.168.22.178 ip
rdr vr1 83.90.239.188/32 -> 192.168.22.223 ip

List of active sessions:
MAP 192.168.22.184  61751 <- -> 83.90.47.30     61751 [172.20.0.1 161]
MAP 192.168.22.186  61750 <- -> 83.90.47.30     61750 [172.20.0.1 161]
MAP 192.168.22.156  61714 <- -> 172.16.4.7      61714 [172.16.4.254 9100]
MAP 192.168.22.122  61745 <- -> 83.90.47.30     61745 [172.20.0.1 161]
MAP 192.168.22.181  61713 <- -> 83.90.47.30     61713 [213.155.157.83 80]
MAP 192.168.22.134  61744 <- -> 83.90.47.30     61744 [208.67.222.222 53]
MAP 192.168.22.134  50740 <- -> 83.90.47.30     50740 [208.67.222.222 53]
MAP 192.168.22.117  60752 <- -> 83.90.47.30     60752 [208.67.222.222 53]
MAP 192.168.22.123  55213 <- -> 83.90.47.30     55213 [172.20.0.1 161]
MAP 192.168.22.184  61709 <- -> 83.90.47.30     61709 [80.208.113.164 443]
MAP 192.168.22.182  55212 <- -> 83.90.47.30     55212 [172.20.0.1 161]
MAP 192.168.22.191  55211 <- -> 83.90.47.30     55211 [172.20.0.1 161]
MAP 192.168.22.197  55210 <- -> 83.90.47.30     55210 [172.20.0.1 161]
MAP 192.168.22.201  55209 <- -> 83.90.47.30     55209 [172.20.0.1 161]
MAP 192.168.22.71   55208 <- -> 83.90.47.30     55208 [172.20.0.1 161]
MAP 192.168.22.184  61703 <- -> 83.90.47.30     61703 [80.208.113.164 443]
MAP 192.168.22.134  55205 <- -> 83.90.47.30     55205 [172.20.0.1 161]
MAP 192.168.22.184  55168 <- -> 83.90.47.30     55168 [172.20.0.1 161]
MAP 192.168.22.184  55167 <- -> 83.90.47.30     55167 [172.20.0.1 161]
MAP 192.168.22.184  55166 <- -> 83.90.47.30     55166 [172.20.0.1 161]
MAP 192.168.22.184  55165 <- -> 83.90.47.30     55165 [172.20.0.1 161]
MAP 192.168.22.184  61653 <- -> 83.90.47.30     61653 [80.208.113.164 443]