Date: Wed, 21 Jan 1998 17:59:44 +0800 (CST) From: "Daniel C. Konnoff" <daniel@myson.com.tw> To: brian@awfulhak.org Cc: questions@FreeBSD.ORG Subject: ppp routing problems Message-ID: <Pine.SUN.3.91.980121172425.14521A-100000@lin_km>
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Hello Brian: In early November 97 you responded to several questions I posted to questions@freebsd.org so I'm mailing you directly. I am in Asia now attempting to debug this and some other problems. Let me briefly refresh you memory. ppp bsd2.2.1 system named tpe <----------> bsd2.2.5 system - mail <--> LAN <--> ISP These two systems, tpe and mail, are connected via user level ppp over a dedicated 14.4 modem line. The mail machine is the principle mail server at the corporate headquarters, part of a local lan connected to the isp through fiber. User level ppp is functioning between mail and tpe but only the telnet function works. Ftp, and rlogin both fail: daniel@mail(12)$ftp tpe Connected to tpe.myson.com.tw. 220 tpe.myson.com.tw FTP server (Version 6.00) ready. Name (tpe:daniel): 331 Password required for daniel. Password: 230 User daniel logged in. Remote system type is UNIX. Using binary mode to transfer files. ftp> pwd 257 "/home/user/daniel" is current directory. ftp> put foo local: foo remote: foo 200 PORT command successful. 425 Can't build data connection: Connection refused. ftp> daniel@mail(13)$rlogin tpe rlogind: Permission denied. daniel@mail(14)$ Neither the mail or the tpe machine are running any type of firewall; before the tpe machine was at the end of the ppp link it was part of the local lan here and all networking commands functioned normally. PPP was the single configuration addition. I've checked inetd.conf, services, and sysconfig on both machines and cannot find anything amiss, so at this point I'm a bit stumped. Nslookup works fine from the ppp client machine tpe: (resolv.conf points to mail) daniel@tpe$ nslookup www.freebsd.org Server: mail.myson.com.tw Address: 172.16.2.1 Name: hub.freebsd.org Address: 204.216.27.18 Aliases: www.freebsd.org daniel@tpe$ So does ping: daniel@tpe$ ping www.freebsd.org PING hub.freebsd.org (204.216.27.18): 56 data bytes 64 bytes from 204.216.27.18: icmp_seq=0 ttl=240 time=569.078 ms 64 bytes from 204.216.27.18: icmp_seq=1 ttl=240 time=650.184 ms but any network connection (ftp, telnet, rlogin) beyond the mail machine fails (ftp and rlogin etc. do not work even to mail as already mentioned). I have tcpdump working on the mail platform and have looked at the traffic between mail and tpe during a ftp session and included it below. First is netstat -rn for both tpe and mail Any help would be greatly appreciated! Thanks in advance. Daniel C. Konnoff Myson Technologies 20111 Stevens Creek Blvd. #138 Cupertino, Ca. 95014 daniel@mysonusa.com.tw Tele: 408/252-8788 Fax: 408/252-8789 daniel@tpe$ netstat -rn Routing tables Internet: Destination Gateway Flags Refs Use Netif Expire default 172.16.2.1 UGSc 1 53 tun0 127.0.0.1 127.0.0.1 UH 0 0 lo0 172.16.2.1 172.16.1.247 UH 4 10434 tun0 192.168.188 link#1 UC 0 0 192.168.188.20 0:c0:f6:0:2:e UHLW 0 7 ed1 348 daniel@tpe$ daniel@mail(7)$netstat -rn Routing tables Internet: Destination Gateway Flags Refs Use Netif Expire default 172.16.1.254 UGSc 21 7 ed0 127.0.0.1 127.0.0.1 UH 0 60 lo0 172.16 link#1 UC 0 0 172.16.1.100 link#1 UHLW 0 5 172.16.1.103 0:c0:b4:1:95:0 UHLW 0 608 ed0 990 172.16.1.109 0:c0:b4:70:12:82 UHLW 0 191 ed0 1087 172.16.1.111 0:c0:b4:70:13:8 UHLW 0 14 ed0 968 172.16.1.113 0:c0:b4:70:13:27 UHLW 0 227 ed0 943 172.16.1.115 0:c0:b4:70:12:a8 UHLW 0 225 ed0 1039 172.16.1.119 0:c0:f6:0:1:46 UHLW 0 184 ed0 1111 172.16.1.123 0:0:e8:2c:61:2c UHLW 0 106 ed0 872 172.16.1.139 0:0:e8:29:fe:20 UHLW 0 1423 ed0 498 172.16.1.149 0:0:e8:39:bb:7f UHLW 1 515 ed0 507 172.16.1.155 0:c0:b4:70:13:2 UHLW 0 79 ed0 1042 172.16.1.160 0:c0:b4:11:11:11 UHLW 0 3 ed0 289 172.16.1.172 0:0:e8:39:b9:65 UHLW 0 63 ed0 185 172.16.1.174 0:c0:b4:70:4:e1 UHLW 0 197 ed0 1003 172.16.1.247 172.16.2.1 UH 2 10355 tun0 172.16.1.247 0:0:e8:1f:e5:69 UHLS2 0 0 ed0 172.16.1.254 8:0:20:22:e4:e8 UHLW 22 17 ed0 821 172.16.2.1 0:0:e8:1f:e5:69 UHLW 1 3419 lo0 172.16.2.3 8:0:20:23:b:16 UHLW 2 14 ed0 624 172.16.2.4 8:0:20:22:e2:d6 UHLW 0 13 ed0 160 172.16.2.6 8:0:20:73:c3:1e UHLW 3 4304 ed0 1187 172.16.2.7 8:0:20:22:97:da UHLW 0 273 ed0 641 172.16.2.8 8:0:20:72:fc:32 UHLW 0 202 ed0 698 172.16.2.10 8:0:20:23:6e:1e UHLW 0 242 ed0 1193 172.16.2.11 8:0:20:73:8:41 UHLW 0 46 ed0 156 172.16.2.12 8:0:20:72:fc:b4 UHLW 0 244 ed0 318 172.16.2.13 8:0:20:20:28:2b UHLW 0 14 ed0 154 172.16.2.14 8:0:20:23:16:2f UHLW 0 1269 ed0 191 172.16.2.15 8:0:20:23:16:a4 UHLW 0 566 ed0 963 172.16.2.17 8:0:20:73:0:49 UHLW 0 505 ed0 1059 172.16.2.18 8:0:20:73:d8:3b UHLW 0 52 ed0 1026 172.16.2.19 8:0:20:22:93:da UHLW 0 244 ed0 398 172.16.2.20 8:0:20:8e:4e:7c UHLW 2 6551 ed0 539 172.16.2.28 8:0:20:22:cf:a7 UHLW 0 119 ed0 114 172.16.2.29 8:0:20:72:14:ac UHLW 0 100 ed0 1030 172.16.2.30 8:0:20:23:30:db UHLW 0 588 172.16.2.31 8:0:20:72:14:8c UHLW 0 859 ed0 396 172.16.2.32 0:1:7a:81:b0:c2 UHLW 0 192 ed0 266 172.16.2.33 8:0:20:d:e6:eb UHLW 0 320 ed0 220 172.16.2.40 8:0:20:8e:b:65 UHLW 0 226 ed0 149 172.16.2.41 8:0:20:8e:4c:2b UHLW 0 20 ed0 1032 172.16.2.42 8:0:20:8e:8:19 UHLW 0 210 ed0 1002 172.16.2.49 0:c0:78:0:0:c8 UHLW 0 101 ed0 1034 172.16.2.53 8:0:20:8e:4c:30 UHLW 0 179 ed0 173 172.16.2.54 8:0:20:8e:a:b4 UHLW 0 84 ed0 1024 172.16.2.57 8:0:20:8e:7:9c UHLW 0 242 ed0 1149 172.16.2.58 8:0:20:8e:52:cf UHLW 0 99 ed0 1127 172.16.2.72 0:c0:78:0:1:7c UHLW 0 239 ed0 28 172.16.2.78 0:40:61:c2:13:b2 UHLW 0 800 ed0 230 172.16.2.79 0:3:e3:d0:4:b UHLW 0 441 ed0 337 172.16.2.97 0:3:e3:c0:4:15 UHLW 0 100 ed0 1189 172.16.2.150 8:0:20:8e:52:b5 UHLW 1 204 ed0 712 daniel@mail(8)$ Here is the ftp session: daniel@mail(20)$ftp tpe Connected to tpe.myson.com.tw. 220 tpe.myson.com.tw FTP server (Version 6.00) ready. Name (tpe:daniel): 331 Password required for daniel. Password: 230 User daniel logged in. Remote system type is UNIX. Using binary mode to transfer files. ftp> bi 200 Type set to I. ftp> pwd 257 "/home/user/daniel" is current directory. ftp> ls 200 PORT command successful. 425 Can't build data connection: Connection refused. ftp> put test local: test remote: test 200 PORT command successful. 425 Can't build data connection: Connection refused. ftp> quit 221 Goodbye. daniel@mail(21)$ Here is the tcpdump output as run on mail during the ftp session shown above: root@mail(64)$tcpdump -i tun0 'host mail and (port ftp or ftp-data)' tcpdump: listening on tun0 17:57:28.108774 mail.myson.com.tw.ansoft-lm-1 > tpe.ftp: S 1520286024:1520286024(0) win 16384 <mss 1460,nop,wscale 0,nop,nop,timestamp 15652 0,nop,nop,cc[|tcp]> (DF) 17:57:28.350234 tpe.ftp > mail.myson.com.tw.ansoft-lm-1: S 1216667494:1216667494(0) ack 1520286025 win 17280 <mss 1460,nop,wscale 0,nop,nop,timestamp 12769 15652,nop,nop,cc[|tcp]> (DF) 17:57:28.350342 mail.myson.com.tw.ansoft-lm-1 > tpe.ftp: . ack 1 win 17280 <nop,nop,timestamp 15652 12769,nop,nop,cc 564> (DF) 17:57:28.700281 tpe.ftp > mail.myson.com.tw.ansoft-lm-1: P 1:56(55) ack 1 win 17280 <nop,nop,timestamp 12770 15652,nop,nop,cc 9> (DF) [tos 0x10] 17:57:28.820057 mail.myson.com.tw.ansoft-lm-1 > tpe.ftp: . ack 56 win 17280 <nop,nop,timestamp 15653 12770,nop,nop,cc 564> (DF) [tos 0x10] 17:57:31.831503 mail.myson.com.tw.ansoft-lm-1 > tpe.ftp: P 1:14(13) ack 56 win 17280 <nop,nop,timestamp 15659 12770,nop,nop,cc 564> (DF) [tos 0x10] 17:57:32.070233 tpe.ftp > mail.myson.com.tw.ansoft-lm-1: P 56:91(35) ack 14 win 17280 <nop,nop,timestamp 12776 15659,nop,nop,cc 9> (DF) [tos 0x10] 17:57:32.220055 mail.myson.com.tw.ansoft-lm-1 > tpe.ftp: . ack 91 win 17280 <nop,nop,timestamp 15660 12776,nop,nop,cc 564> (DF) [tos 0x10] 17:57:38.390405 mail.myson.com.tw.ansoft-lm-1 > tpe.ftp: P 14:28(14) ack 91 win 17280 <nop,nop,timestamp 15672 12776,nop,nop,cc 564> (DF) [tos 0x10] 17:57:38.710215 tpe.ftp > mail.myson.com.tw.ansoft-lm-1: . ack 28 win 17280 <nop,nop,timestamp 12790 15672,nop,nop,cc 9> (DF) [tos 0x10] 17:57:38.850235 tpe.ftp > mail.myson.com.tw.ansoft-lm-1: P 91:119(28) ack 28 win 17280 <nop,nop,timestamp 12790 15672,nop,nop,cc 9> (DF) [tos 0x10] 17:57:38.850875 mail.myson.com.tw.ansoft-lm-1 > tpe.ftp: P 28:34(6) ack 119 win 17280 <nop,nop,timestamp 15673 12790,nop,nop,cc 564> (DF) [tos 0x10] 17:57:39.100292 tpe.ftp > mail.myson.com.tw.ansoft-lm-1: P 119:158(39) ack 34 win 17280 <nop,nop,timestamp 12790 15673,nop,nop,cc 9> (DF) [tos 0x10] 17:57:39.220065 mail.myson.com.tw.ansoft-lm-1 > tpe.ftp: . ack 158 win 17280 <nop,nop,timestamp 15674 12790,nop,nop,cc 564> (DF) [tos 0x10] 17:57:41.270320 mail.myson.com.tw.ansoft-lm-1 > tpe.ftp: P 34:42(8) ack 158 win 17280 <nop,nop,timestamp 15678 12790,nop,nop,cc 564> (DF) [tos 0x10] 17:57:41.490302 tpe.ftp > mail.myson.com.tw.ansoft-lm-1: P 158:178(20) ack 42 win 17280 <nop,nop,timestamp 12795 15678,nop,nop,cc 9> (DF) [tos 0x10] 17:57:41.620059 mail.myson.com.tw.ansoft-lm-1 > tpe.ftp: . ack 178 win 17280 <nop,nop,timestamp 15679 12795,nop,nop,cc 564> (DF) [tos 0x10] 17:57:43.772146 mail.myson.com.tw.ansoft-lm-1 > tpe.ftp: P 42:47(5) ack 178 win 17280 <nop,nop,timestamp 15683 12795,nop,nop,cc 564> (DF) [tos 0x10] 17:57:44.010285 tpe.ftp > mail.myson.com.tw.ansoft-lm-1: P 178:225(47) ack 47 win 17280 <nop,nop,timestamp 12800 15683,nop,nop,cc 9> (DF) [tos 0x10] 17:57:44.020074 mail.myson.com.tw.ansoft-lm-1 > tpe.ftp: . ack 225 win 17280 <nop,nop,timestamp 15684 12800,nop,nop,cc 564> (DF) [tos 0x10] 17:57:47.031004 mail.myson.com.tw.ansoft-lm-1 > tpe.ftp: P 47:55(8) ack 225 win 17280 <nop,nop,timestamp 15690 12800,nop,nop,cc 564> (DF) [tos 0x10] 17:57:47.250234 tpe.ftp > mail.myson.com.tw.ansoft-lm-1: P 225:245(20) ack 55 win 17280 <nop,nop,timestamp 12807 15690,nop,nop,cc 9> (DF) [tos 0x10] 17:57:47.250659 mail.myson.com.tw.ansoft-lm-1 > tpe.ftp: P 55:79(24) ack 245 win 17280 <nop,nop,timestamp 15690 12807,nop,nop,cc 564> (DF) [tos 0x10] 17:57:47.460260 tpe.ftp > mail.myson.com.tw.ansoft-lm-1: P 245:275(30) ack 79 win 17280 <nop,nop,timestamp 12807 15690,nop,nop,cc 9> (DF) [tos 0x10] 17:57:47.460964 mail.myson.com.tw.ansoft-lm-1 > tpe.ftp: P 79:85(6) ack 275 win 17280 <nop,nop,timestamp 15690 12807,nop,nop,cc 564> (DF) [tos 0x10] 17:57:47.730219 tpe.ftp > mail.myson.com.tw.ansoft-lm-1: . ack 85 win 17280 <nop, nop,timestamp 12808 15690,nop,nop,cc 9> (DF) [tos 0x10] 17:57:47.900244 tpe.ftp > mail.myson.com.tw.ansoft-lm-1: P 275:329(54) ack 85 win 17280 <nop,nop,timestamp 12808 15690,nop,nop,cc 9> (DF) [tos 0x10] 17:57:48.020058 mail.myson.com.tw.ansoft-lm-1 > tpe.ftp: . ack 329 win 17280 <nop,nop,timestamp 15692 12808,nop,nop,cc 564> (DF) [tos 0x10] 17:57:51.814949 mail.myson.com.tw.ansoft-lm-1 > tpe.ftp: P 85:93(8) ack 329 win 17280 <nop,nop,timestamp 15699 12808,nop,nop,cc 564> (DF) [tos 0x10] 17:57:52.030236 tpe.ftp > mail.myson.com.tw.ansoft-lm-1: P 329:349(20) ack 93 win 17280 <nop,nop,timestamp 12816 15699,nop,nop,cc 9> (DF) [tos 0x10] 17:57:52.030847 mail.myson.com.tw.ansoft-lm-1 > tpe.ftp: P 93:117(24) ack 349 win 17280 <nop,nop,timestamp 15700 12816,nop,nop,cc 564> (DF) [tos 0x10] 17:57:52.260238 tpe.ftp > mail.myson.com.tw.ansoft-lm-1: P 349:379(30) ack 117 win 17280 <nop,nop,timestamp 12817 15700,nop,nop,cc 9> (DF) [tos 0x10] 17:57:52.260908 mail.myson.com.tw.ansoft-lm-1 > tpe.ftp: P 117:128(11) ack 379 win 17280 <nop,nop,timestamp 15700 12817,nop,nop,cc 564> (DF) [tos 0x10] 17:57:52.520223 tpe.ftp > mail.myson.com.tw.ansoft-lm-1: . ack 128 win 17280 <nop,nop,timestamp 12817 15700,nop,nop,cc 9> (DF) [tos 0x10] 17:57:52.730255 tpe.ftp > mail.myson.com.tw.ansoft-lm-1: P 379:433(54) ack 128 win 17280 <nop,nop,timestamp 12818 15700,nop,nop,cc 9> (DF) [tos 0x10] 17:57:52.820058 mail.myson.com.tw.ansoft-lm-1 > tpe.ftp: . ack 433 win 17280 <nop,nop,timestamp 15701 12818,nop,nop,cc 564> (DF) [tos 0x10] 17:58:17.095410 mail.myson.com.tw.ansoft-lm-1 > tpe.ftp: P 128:134(6) ack 433 win 17280 <nop,nop,timestamp 15750 12818,nop,nop,cc 564> (DF) [tos 0x10] 17:58:17.310232 tpe.ftp > mail.myson.com.tw.ansoft-lm-1: P 433:447(14) ack 134 win 17280 <nop,nop,timestamp 12867 15750,nop,nop,cc 9> (DF) [tos 0x10] 17:58:17.310842 mail.myson.com.tw.ansoft-lm-1 > tpe.ftp: F 134:134(0) ack 447 win 17280 <nop,nop,timestamp 15750 12867,nop,nop,cc 564> (DF) [tos 0x10] 17:58:17.360233 tpe.ftp > mail.myson.com.tw.ansoft-lm-1: F 447:447(0) ack 134 win 17280 <nop,nop,timestamp 12867 15750,nop,nop,cc 9> (DF) [tos 0x10] 17:58:17.360322 mail.myson.com.tw.ansoft-lm-1 > tpe.ftp: F 134:134(0) ack 448 win 17280 <nop,nop,timestamp 15750 12867,nop,nop,cc 564> (DF) [tos 0x10] 17:58:17.520217 tpe.ftp > mail.myson.com.tw.ansoft-lm-1: F 447:447(0) ack 135 win 17280 <nop,nop,timestamp 12867 15750,nop,nop,cc 9> (DF) [tos 0x10] 17:58:17.520296 mail.myson.com.tw.ansoft-lm-1 > tpe.ftp: . ack 448 win 17280 <nop,nop,timestamp 15751 12867,nop,nop,cc 564> (DF) [tos 0x10] 17:58:17.550243 tpe.ftp > mail.myson.com.tw.ansoft-lm-1: . ack 135 win 17280 <nop,nop,timestamp 12867 15750,nop,nop,cc 9> (DF) [tos 0x10] ^C 339 packets received by filter 0 packets dropped by kernel root@mail(65)$
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