From owner-freebsd-questions Mon Sep 13 12: 8:48 1999 Delivered-To: freebsd-questions@freebsd.org Received: from aag.alaskaair.com (outbound.alaskaair.com [159.49.42.191]) by hub.freebsd.org (Postfix) with SMTP id 8772815364 for ; Mon, 13 Sep 1999 12:08:37 -0700 (PDT) (envelope-from elazich@AlaskaAir.com) Received: from OUTBOUND.alaskaair.com by aag.alaskaair.com via smtpd (for hub.FreeBSD.org [204.216.27.18]) with SMTP; 13 Sep 1999 19:11:45 UT Received: from asnasta (asnasta.alaskaair.com [159.49.42.21]) by outbound.alaskaair.com (8.9.3/8.9.3) with SMTP id LAA29969; Mon, 13 Sep 1999 11:51:31 -0700 From: elazich@AlaskaAir.com To: ru@ucb.crimea.ua Cc: freebsd-questions@FreeBSD.ORG Date: Mon, 13 Sep 1999 11:49:39 -0700 Subject: Re: IPFW & NATD Message-ID: References: <19990913210504.D88685@relay.ucb.crimea.ua> <19990913212704.A98610@relay.ucb.crimea.ua> Organization: Alaska Airlines MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8bit Content-ID: X-Gateway: NASTA Gate 2.0 for FirstClass(R) Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG See below for tcpdump out put, I also included a capture of general traffic, youoo can see 10.0.0.2 <-> 10.0.0.6 (which is the print server) quite a bit. Eli ru@ucb.crimea.ua writes: >On Mon, Sep 13, 1999 at 11:11:45AM -0700, elazich@AlaskaAir.com wrote: >> Here is a copy of netstat -rn output, thanks for your help. >> >> >capricorn# netstat -rn >> >Routing tables >> >> >Internet: >> >Destination Gateway Flags Refs Use >Netif >> >Expire >> >default 207.149.134.129 UGSc 48 65116 lnc1 >> >10/24 link#1 UC 0 0 vx0 >> >10.0.0.1 0:a0:24:bd:f8:af UHLW 0 10 lo0 >> >10.0.0.3 0:0:1b:4a:9e:35 UHLS 0 28 vx0 >> >10.0.0.4 0:0:c:3e:1f:d1 UHLW 0 18 >vx0 >> >1106 >> >127.0.0.1 127.0.0.1 UH 0 24 lo0 >> >207.149.134.128/27 link#2 UC 0 0 lnc1 >> >207.149.134.129 0:0:c:6a:78:c UHLW 47 0 >lnc1 >> > 587 >> >207.149.134.143 0:80:29:68:52:c4 UHLW 1 467 lo0 >> >capricorn# >> >> Eli >> >> ru@ucb.crimea.ua writes: >> >On Mon, Sep 13, 1999 at 10:01:40AM -0700, elazich@AlaskaAir.com >wrote: >> >> I have a FBSD box with 2 NICs (vx0 and lnc1) which I am running >ipfw >> >> and natd on. vx0 is on my internal net using a 10 block address >and >> >> lnc1 is on my external connection. I had compiled in support for >IPFW >> >> in the kernel and run natd -interface lnc1. My IPFW rules look >like >> >> this, >> >> >> >> capricorn# ipfw -a l >> >> 00100 82838 9639926 divert 8668 ip from any to any via lnc1 >> >> 00200 84517 9917180 allow ip from any to any >> >> 65535 16 1696 deny ip from any to any >> >> capricorn# >> >> >> >> Output of ifconfig -a is; >> >> >> >> capricorn# ifconfig -a >> >> vx0: flags=8843 mtu 1500 >> >> inet 10.0.0.1 netmask 0xffffff00 broadcast 10.0.0.255 >> >> ether 00:a0:24:bd:f8:af >> >> >> >netmask on this interface is set for Class C network. Is this >> >intentional? >> >> >> lnc1: flags=8843 mtu 1500 >> >> inet 207.149.134.143 netmask 0xffffffe0 broadcast >> >> 207.149.134.159 >> >> ether 00:80:29:68:52:c4 >> >> lp0: flags=8810 mtu 1500 >> >> tun0: flags=8010 mtu 1500 >> >> sl0: flags=c010 mtu 552 >> >> ppp0: flags=8010 mtu 1500 >> >> lo0: flags=8049 mtu 16384 >> >> inet 127.0.0.1 netmask 0xff000000 >> >> capricorn# >> >> >> >> I run natd -interface lnc1, this was all working fine for quite >some >> >> time but now I cannot seem to even ping anything on my loal network >> >> from the firewall box. Any other machine on my 10 net can talk to >> >each >> >> other (but they cannot reach the firewall), and what's even >starnger >> >is >> >> that when I run tcpdump on my firewall it picks up traffic on the >10 >> >> network. Does anyone know what is going on here and how I can get >> >> myself back to functional status? >> >> >> >What does `netstat -rn' produce? >> >Please run the following commands simulteneously (on two different >terminals) from the `firewall' host: ># script tcpdump.out tcpdump -n -i vx0 host 10.0.0.3 and icmp >Script started on Mon Sep 13 11:20:29 1999 >tcpdump: listening on vx0 >11:20:33.645297 10.0.0.1 > 10.0.0.3: icmp: echo request >11:20:34.651820 10.0.0.1 > 10.0.0.3: icmp: echo request >11:20:35.661825 10.0.0.1 > 10.0.0.3: icmp: echo request >11:20:36.671940 10.0.0.1 > 10.0.0.3: icmp: echo request >11:20:37.681858 10.0.0.1 > 10.0.0.3: icmp: echo request >11:20:38.691873 10.0.0.1 > 10.0.0.3: icmp: echo request >11:20:39.701883 10.0.0.1 > 10.0.0.3: icmp: echo request >11:20:40.711903 10.0.0.1 > 10.0.0.3: icmp: echo request >11:20:41.721918 10.0.0.1 > 10.0.0.3: icmp: echo request >11:20:42.731939 10.0.0.1 > 10.0.0.3: icmp: echo request >^C >71 packets received by filter >0 packets dropped by kernel >Script done on Mon Sep 13 11:21:09 1999 >capricorn# ># script ping.out ping -c 10 10.0.0.3 >Script started on Mon Sep 13 11:20:33 1999 >PING 10.0.0.3 (10.0.0.3): 56 data bytes >--- 10.0.0.3 ping statistics --- >10 packets transmitted, 0 packets received, 100% packet loss >Script done on Mon Sep 13 11:20:53 1999 >capricorn# Script started on Mon Sep 13 11:30:20 1999 tcpdump: listening on vx0 11:30:20.541455 0.00:a0:c9:3d:fb:63.6002 > 0.ff:ff:ff:ff:ff:ff.452:ipx-sap-neare st-req 4 '^J' 11:30:22.988484 0:0:c:3e:1f:d1 0:0:c:3e:1f:d1 9000 60: 0000 0100 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 11:30:25.535257 0:a0:c9:3d:fb:63 > ff:ff:ff:ff:ff:ff sap e0 ui/C len=43 ffff 0022 0004 0000 0000 ffff ffff ffff 0452 0000 0000 00a0 c93d fb63 6002 0001 0004 0006 040f 008b 0049 96 11:30:26.174703 10.0.0.2.1039 > 10.0.0.6.139: P 4823752:4823876(124) ack 1679220 8 win 8760 (DF) 11:30:26.183193 10.0.0.6.139 > 10.0.0.2.1039: . 1:444(443) ack 124 win 2920 11:30:26.183517 10.0.0.2.1039 > 10.0.0.6.139: P 124:245(121) ack 444 win 8317 (D F) 11:30:26.192521 10.0.0.6.139 > 10.0.0.2.1039: . 444:884(440) ack 245 win 2920 11:30:26.341624 10.0.0.2.1039 > 10.0.0.6.139: . ack 884 win 7877 (DF) 11:30:29.710038 10.0.0.2.1039 > 10.0.0.6.139: P 245:369(124) ack 884 win 7877 (D F) 11:30:29.718528 10.0.0.6.139 > 10.0.0.2.1039: . 884:1327(443) ack 369 win 2920 11:30:29.718881 10.0.0.2.1039 > 10.0.0.6.139: P 369:490(121) ack 1327 win 7434 ( DF) 11:30:29.728734 10.0.0.6.139 > 10.0.0.2.1039: . 1327:1767(440) ack 490 win 2920 11:30:29.846718 10.0.0.2.1039 > 10.0.0.6.139: . ack 1767 win 8760 (DF) 11:30:30.526160 0:a0:c9:3d:fb:63 > ff:ff:ff:ff:ff:ff sap e0 ui/C len=43 ffff 0022 0004 0000 0000 ffff ffff ffff 0452 0000 0000 00a0 c93d fb63 6002 0001 0004 0a00 0002 008b 040f 01 11:30:32.988835 0:0:c:3e:1f:d1 0:0:c:3e:1f:d1 9000 60: 0000 0100 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 11:30:35.518538 0:a0:c9:3d:fb:63 > ff:ff:ff:ff:ff:ff sap e0 ui/C len=43 ffff 0022 0004 0000 0000 ffff ffff ffff 0452 0000 0000 00a0 c93d fb63 6002 0001 0004 0006 040f 008b 0049 98 11:30:36.185780 10.0.0.2.1039 > 10.0.0.6.139: P 490:614(124) ack 1767 win 8760 ( DF) 11:30:36.193867 10.0.0.6.139 > 10.0.0.2.1039: . 1767:2210(443) ack 614 win 2920 11:30:36.194204 10.0.0.2.1039 > 10.0.0.6.139: P 614:735(121) ack 2210 win 8317 ( DF) 11:30:36.203191 10.0.0.6.139 > 10.0.0.2.1039: . 2210:2650(440) ack 735 win 2920 11:30:36.356141 10.0.0.2.1039 > 10.0.0.6.139: . ack 2650 win 7877 (DF) 11:30:39.713819 10.0.0.2.1039 > 10.0.0.6.139: P 735:859(124) ack 2650 win 7877 ( DF) 11:30:39.722317 10.0.0.6.139 > 10.0.0.2.1039: . 2650:3093(443) ack 859 win 2920 11:30:39.722656 10.0.0.2.1039 > 10.0.0.6.139: P 859:980(121) ack 3093 win 7434 ( DF) 11:30:39.731653 10.0.0.6.139 > 10.0.0.2.1039: . 3093:3533(440) ack 980 win 2920 11:30:40.511591 0.00:a0:c9:3d:fb:63.6002 > 0.ff:ff:ff:ff:ff:ff.452:ipx-sap-req 4 '^J' 11:30:42.485769 10.0.0.1 > 10.0.0.3: icmp: echo request 11:30:42.989193 0:0:c:3e:1f:d1 0:0:c:3e:1f:d1 9000 60: 0000 0100 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 11:30:43.490991 10.0.0.1 > 10.0.0.3: icmp: echo request 11:30:44.501003 10.0.0.1 > 10.0.0.3: icmp: echo request 11:30:45.503266 0.00:a0:c9:3d:fb:63.6002 > 0.ff:ff:ff:ff:ff:ff.452:ipx-sap-req 4 '^J' 11:30:45.511019 10.0.0.1 > 10.0.0.3: icmp: echo request 11:30:46.191903 10.0.0.6.139 > 10.0.0.2.1039: . 3533:3976(443) ack 1104 win 2920 11:30:46.192244 10.0.0.2.1039 > 10.0.0.6.139: P 1104:1225(121) ack 3976 win 8317 (DF) 11:30:46.202099 10.0.0.6.139 > 10.0.0.2.1039: . 3976:4416(440) ack 1225 win 2920 11:30:46.370581 10.0.0.2.1039 > 10.0.0.6.139: . ack 4416 win 7877 (DF) 11:30:46.521037 10.0.0.1 > 10.0.0.3: icmp: echo request 11:30:47.531128 10.0.0.1 > 10.0.0.3: icmp: echo request 11:30:48.541097 10.0.0.1 > 10.0.0.3: icmp: echo request 11:30:49.551096 10.0.0.1 > 10.0.0.3: icmp: echo request 11:30:49.719466 10.0.0.2.1039 > 10.0.0.6.139: P 1225:1349(124) ack 4416 win 7877 (DF) 11:30:49.727973 10.0.0.6.139 > 10.0.0.2.1039: . 4416:4859(443) ack 1349 win 2920 11:30:49.728290 10.0.0.2.1039 > 10.0.0.6.139: P 1349:1470(121) ack 4859 win 7434 (DF) 11:30:49.737300 10.0.0.6.139 > 10.0.0.2.1039: . 4859:5299(440) ack 1470 win 2920 11:30:49.875674 10.0.0.2.1039 > 10.0.0.6.139: . ack 5299 win 8760 (DF) 11:30:50.495642 0.00:a0:c9:3d:fb:63.6002 > 0.ff:ff:ff:ff:ff:ff.452:ipx-sap-req 4 '^J' 11:30:50.561109 10.0.0.1 > 10.0.0.3: icmp: echo request 11:30:51.571111 10.0.0.1 > 10.0.0.3: icmp: echo request 11:30:52.989604 0:0:c:3e:1f:d1 0:0:c:3e:1f:d1 9000 60: 0000 0100 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 11:30:55.488696 0.00:a0:c9:3d:fb:63.6002 > 0.ff:ff:ff:ff:ff:ff.452:ipx-sap-req 4 '' 11:30:56.196485 10.0.0.6.139 > 10.0.0.2.1039: . 5299:5742(443) ack 1594 win 2920 11:30:56.196793 10.0.0.2.1039 > 10.0.0.6.139: P 1594:1715(121) ack 5742 win 8317 (DF) 11:30:56.205642 10.0.0.6.139 > 10.0.0.2.1039: . 5742:6182(440) ack 1715 win 2920 11:30:56.384999 10.0.0.2.1039 > 10.0.0.6.139: . ack 6182 win 7877 (DF) ^C 54 packets received by filter 0 packets dropped by kernel Script done on Mon Sep 13 11:30:56 1999 capricorn# >After ping(8) is finished, press +C on both terminals >and send me tcpdump.out and ping.out files. >-- >Ruslan Ermilov Sysadmin and DBA of the >ru@ucb.crimea.ua United Commercial Bank, >ru@FreeBSD.org FreeBSD committer, >+380.652.247.647 Simferopol, Ukraine >http://www.FreeBSD.org The Power To Serve >http://www.oracle.com Enabling The Information Age >To Unsubscribe: send mail to majordomo@FreeBSD.org >with "unsubscribe freebsd-questions" in the body of the message >Received: from aag.alaskaair.com (aag.alaskaair.com [159.49.42.2]) by >asnasta.alaskaair.com with SMTP id MSGIETZJ; Mon, 13 Sep 1999 18:34:54 >GMT >Received: from hub.FreeBSD.org ([204.216.27.18]) by 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