Date: Tue, 3 Dec 1996 12:35:53 -0600 (CST) From: Mark Tinguely <tinguely@plains.nodak.edu> To: freebsd-questions@freebsd.org Subject: NAT/pppd problem revisited Message-ID: <199612031835.MAA11050@plains.nodak.edu>
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I am having problems setting NAT, I removed the Cisco Terminal Server for experiments, now I have: FreeBSD 2.1.5-RELEASE #1 ed0 10.1.0.3/255.255.255.0 ^^ || || || vv ed0 10.1.0.2/255.255.255.0 FreeBSD 2.1.5-RELEASE #2 (ip_fil3.0, gateway enabled) ppp0 10.1.10.2/255.255.255.0 ^ | | | v ppp0 10.1.10.1/255.255.255.0 FreeBSD 2.1.5-RELEASE #3 I run tcpdump on port host ed0 #1 ed0 #2 ppp0 #2 ppp0 #3 I use NAT translations of: map ppp0 10.1.0.3/32 -> 10.1.10.2/32 portmap tcp 1025:20000 ^^^ note: I can't get ipnat to take "tcp/udp" the ppp0 tcpdumps for a telnet from 10.1.0.3 (#1) to 10.1.10.1 (#3) sees: 12:26:58.337540 10.1.10.2.1026 > 10.1.10.1.23: S 1285952001:1285952001(0) win 16384 <mss 1460,nop,wscale 0,nop,nop,timestamp 20075 0,nop,nop,ccnew| (DF) [tos 0x10] 12:27:04.053407 10.1.10.2.1026 > 10.1.10.1.23: S 1285952001:1285952001(0) win 16384 <mss 1460,nop,wscale 0,nop,nop,timestamp 20086 0,nop,nop,ccnew| (DF) [tos 0x10] 12:27:28.047110 10.1.10.2.1026 > 10.1.10.1.23: S 1285952001:1285952001(0) win 16384 <mss 1460,nop,wscale 0,nop,nop,timestamp 20134 0,nop,nop,ccnew| (DF) [tos 0x10] so I know NAT on #2 did translate the 10.1.0.3 address to a 10.1.10.2 address but there something about that packet that #3 does not respond. netstat -i counts these packets but reports no errors. any ideas? --mark.
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