Date: Tue, 30 Mar 1999 18:50:25 -0500 (EST) From: Troy Settle <rewt@i-Plus.net> To: "(ML) FreeBSD ISP" <freebsd-isp@freebsd.org> Subject: IPFW - NATD Weirdness Message-ID: <Pine.BSF.4.10.9903301819020.17275-100000@buggy.i-plus.net>
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Hey all,
I'm running natd on a 2.2-STABLE server, which lives on a network along
with a cisco 2501 and 3 Ascend 4048's.
The network config is as follows:
209.100.20.96/27
209.100.20.97 - Cisco - Default route
209.100.20.99 - 4048
209.100.20.100 - 4048
209.100.20.101 - 4048
209.100.20.126 - FreeBSD box with natd
209.100.20.127 - Broadcast
Coming off the FreeBSD box on ed2, is a customer network (10.10.100.0/24)
# ifconfig -a
ed1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
inet 209.100.20.126 netmask 0xffffffe0 broadcast 209.100.20.127
ether 00:60:67:65:b0:30
ed2: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
inet 10.10.100.1 netmask 0xffffff00 broadcast 10.10.100.255
ether 00:60:67:4e:23:b2
natd is running bare: natd -n ed1
Everything works fine until I add the ipfw rules to enable network address
translation:
ipfw add 00100 pass all from any to any via lo0
ipfw add 00200 deny all from any to 127.0.0.0/8
ipfw add 00300 divert natd all from any to any via ed1
ipfw add 65535 allow ip from any to any
At this time, the FreeBSD box starts interfering with the traffic destined
for 209.100.20.101, making it impossible for anyone dialed up to that box
to use the network. For example:
PING p3.i-plus.net (209.100.20.101): 56 data bytes
64 bytes from 209.100.20.101: icmp_seq=0 ttl=253 time=9.875 ms
64 bytes from 209.100.20.126: icmp_seq=0 ttl=252 time=9.962 ms (DUP!)
64 bytes from 209.100.20.101: icmp_seq=1 ttl=253 time=8.369 ms
64 bytes from 209.100.20.126: icmp_seq=1 ttl=252 time=8.456 ms (DUP!)
I have no explanation for this behavior, though I can duplicate it from
outside my network.
I've double checked all my configurations, from end to end, and everything
looks good, from subnets to routes.
And, just to repeat myself, this behavior only presents itself when I have
a divert in my ipfw config.
Thanks in advance,
--
Troy Settle <st@i-Plus.net>
Network Administrator, iPlus Internet Services
http://www.i-Plus.net
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