Date: Thu, 12 Nov 1998 12:17:30 -0500 (EST) From: austin wood <awood@fault.net> To: freebsd-net@FreeBSD.ORG Subject: NATD Problems Message-ID: <Pine.BSF.4.02A.9811121153430.1990-100000@seg.fault.net>
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I spent a long time setting up my freebsd box so it dials to my ISP
with kernel ppp and it acts as a gateway. For packet aliasing, I use
natd. I am very happy with the setup, except I think that natd is
blocking some tcp packets. This results in a connection timeouts on
particular site. If this is not fixable, I will go to ppp -alias instead.
Here is an example of what happens when I try to connect.
# natd -interface ppp0 -v
Out [UDP] 10.1.1.3 -> 207.172.3.16 aliased to
207.96.19.192 -> 207.172.3.16
In [UDP] 207.172.3.16 -> 207.96.19.192 aliased to
207.172.3.16 -> 10.1.1.3
Out [TCP] 10.1.1.3:1103 -> 198.138.176.19:80 aliased to
207.96.19.192:1103 -> 198.138.176.19:80
In [TCP] 198.138.176.19:80 -> 207.96.19.192:1103 aliased to
198.138.176.19:80 -> 10.1.1.3:1103
Out [TCP] 10.1.1.3:1103 -> 198.138.176.19:80 aliased to
207.96.19.192:1103 -> 198.138.176.19:80
Out [TCP] 10.1.1.3:1103 -> 198.138.176.19:80 aliased to
207.96.19.192:1103 -> 198.138.176.19:80
Out [TCP] 10.1.1.3:1103 -> 198.138.176.19:80 aliased to
207.96.19.192:1103 -> 198.138.176.19:80
In [TCP] 198.138.176.19:80 -> 207.96.19.192:1103 aliased to
198.138.176.19:80 -> 10.1.1.3:1103
I think it's not forwarding that last packet because netscape remains in
the "Waiting for reply..." state. Here is a list of sites to which a
connection cannot be established.
http://www.collegeboard.org/
http://www.hotmail.com/
http://www.idsoftware.com/
http://www.futurestep.com/
My configuration files:
/etc/rc.conf:
tcp_extensions="NO"
firewall_enable="YES"
firewall_type="open"
network_interfaces="ep0 lo0 ppp0"
ifconfig_lo0="inet 127.0.0.1"
ifconfig_ep0="inet 10.1.1.1 netmask 255.255.255.0 link2"
ifconfig_ppp0=
gateway_enable="YES"
/etc/rc.firewall:
if [ "${firewall_type}" = "open" -o "${firewall_type}" = "OPEN" ]; then
$fwcmd -f flush
$fwcmd add divert natd all from any to any via ppp0
$fwcmd add pass all from any to any
/etc/services:
natd 6668/divert
kernel:
options IPFIREWALL
options IPDIVERT
I think that's all the configuration files needed.
I use "natd -interface ppp0" to start it.
Thanks in Advance,
Austin Wood
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