Date: Fri, 12 Jan 2007 01:12:16 -0500 From: bobmc <bobmc@bobmc.net> To: FreeBSD Questions <questions@freebsd.org> Subject: Re: UDP ok but TCP delayed Message-ID: <45A726C0.5070403@bobmc.net>
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Hi Ian: (I post to the list because your's bounced? The Postfix program <smithi@nimnet.asn.au>: host gaia.nimnet.asn.au[203.41.52.131] said: 550 Access denied (in reply to MAIL FROM command) ---------------------------------------------------- Thanks for your reply. Compared to Linux tcpdump, FreeBSD is issuing extra packets, those "AAAA" you mentioned. I have a Netopia modem with RJ45 to a router or optical modem in the condo basement. From there is an optical link to my ISP about 10km away who provides nothing but email forwarding, a DHCP lease, and an internet connect. I have included dumps from Linux and FreeBSD but I have not yet finished all the tests you suggested. IPv6 is not enabled according to the /etc/defaults. I tinkered with various options without making a difference. Thank you, -Bob- whois fcibroadband.com Domain Name: FCIBROADBAND.COM Registrar: NETWORK SOLUTIONS, LLC. Whois Server: whois.networksolutions.com Referral URL: http://www.networksolutions.com Name Server: DNS-01.FUTUREWAY.COM Name Server: DNS-03.FUTUREWAY.COM Status: clientTransferProhibited Domain servers in listed order: DNS-01.FUTUREWAY.COM 64.119.104.2 DNS-03.FUTUREWAY.COM 64.119.104.130 +++++++++++++++++++ Linux tcpdump ++++++++++++++++++++++++ uname -a Linux buffy 2.6.15-26-386 #1 PREEMPT Wed Jul 19 12:14:26 EDT 2006 i686 GNU/Linux root@3[bobmc]# tcpdump -v tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes 21:44:49.547037 IP (tos 0x0, ttl 64, id 13665, offset 0, flags [DF], proto: UDP (17), length: 61) 192.168.1.100.1032 > 192.168.1.254.domain: 44611+ A? www.freebsd.org. (33) 21:44:49.567857 IP (tos 0x0, ttl 64, id 13670, offset 0, flags [DF], proto: UDP (17), length: 72) 192.168.1.100.1033 > 192.168.1.254.domain: 16632+ PTR? 254.1.168.192.in-addr.arpa. (44) 21:44:49.633987 IP (tos 0x0, ttl 255, id 240, offset 0, flags [none], proto: UDP (17), length: 173) 192.168.1.254.domain > 192.168.1.100.1032: 44611 1/4/0 www.freebsd.org. A www.freebsd.org (145) 21:44:49.644775 IP (tos 0x0, ttl 64, id 31888, offset 0, flags [DF], proto: TCP (6), length: 52) 192.168.1.100.3587 > www.freebsd.org.www: S, cksum 0xc114 (correct), 3828632041:3828632041(0) win 5840 <mss 1460,nop,nop,sackOK,nop,wscale 2> 21:44:49.726336 IP (tos 0x0, ttl 56, id 27781, offset 0, flags [DF], proto: TCP (6), length: 48) www.freebsd.org.www > 192.168.1.100.3587: S, cksum 0x7cc5 (correct), 3180712628:3180712628(0) ack 3828632042 win 57344 <mss 1408,nop,wscale 0> 21:44:49.726416 IP (tos 0x0, ttl 64, id 31889, offset 0, flags [DF], proto: TCP (6), length: 40) 192.168.1.100.3587 > www.freebsd.org.www: ., cksum 0x82a2 (correct), ack 1 win 1460 21:44:49.726516 IP (tos 0x0, ttl 64, id 31890, offset 0, flags [DF], proto: TCP (6), length: 578) 192.168.1.100.3587 > www.freebsd.org.www: P 1:539(538) ack 1 win 1460 ...etc --------------- FreeBSD version ---------------- $ uname -a FreeBSD buffy.feline.cat 6.1-RELEASE FreeBSD 6.1-RELEASE #0: Sun May 7 04:32:43 UTC 2006 root@opus.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC i386 $ ifconfig -a vr0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500 inet6 fe80::240:63ff:fee6:41ba%vr0 prefixlen 64 scopeid 0x1 inet 192.168.1.102 netmask 0xffffff00 broadcast 255.255.255.255 ether 00:40:63:e6:41:ba media: Ethernet autoselect (100baseTX <full-duplex>) status: active plip0: flags=108810<POINTOPOINT,SIMPLEX,MULTICAST,NEEDSGIANT> mtu 1500 lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384 inet6 ::1 prefixlen 128 inet6 fe80::1%lo0 prefixlen 64 scopeid 0x3 inet 127.0.0.1 netmask 0xff000000 lease { interface "vr0"; fixed-address 192.168.1.102; option subnet-mask 255.255.255.0; option routers 192.168.1.254; option domain-name-servers 192.168.1.254; option broadcast-address 255.255.255.255; option dhcp-lease-time 3600; option dhcp-message-type 5; option dhcp-server-identifier 192.168.1.254; option dhcp-renewal-time 1800; option dhcp-rebinding-time 3150; renew 4 2007/1/11 04:57:09; rebind 4 2007/1/11 05:19:39; expire 4 2007/1/11 05:27:09; } buffy# tcpdump -vv tcpdump: listening on vr0, link-type EN10MB (Ethernet), capture size 96 bytes 22:29:06.250801 IP (tos 0x0, ttl 64, id 81, offset 0, flags [none], proto: UDP (17), length: 61) 192.168.1.102.50460 > 192.168.1.254.domain: [udp sum ok] 53280+ A? www.freebsd.org. (33) 22:29:06.257223 IP (tos 0x0, ttl 255, id 761, offset 0, flags [none], proto: UDP (17), length: 205) 192.168.1.254.domain > 192.168.1.102.50460: 53280 q: A? www.freebsd.org. 1/4/2 www.freebsd.org. A www.freebsd.org ns: freebsd.org.[|domain] 22:29:06.260101 IP (tos 0x0, ttl 64, id 82, offset 0, flags [none], proto: UDP (17), length: 61) 192.168.1.102.55466 > 192.168.1.254.domain: [udp sum ok] 53281+ AAAA? www.freebsd.org. (33) 22:29:07.086122 IP (tos 0x0, ttl 64, id 83, offset 0, flags [none], proto: UDP (17), length: 72) 192.168.1.102.62917 > 192.168.1.254.domain: [udp sum ok] 18530+ PTR? 254.1.168.192.in-addr.arpa. (44) 22:29:11.259943 IP (tos 0x0, ttl 64, id 84, offset 0, flags [none], proto: UDP (17), length: 61) 192.168.1.102.64085 > 192.168.1.254.domain: [udp sum ok] 53281+ AAAA? www.freebsd.org. (33) 22:29:12.085771 IP (tos 0x0, ttl 64, id 85, offset 0, flags [none], proto: UDP (17), length: 72) 192.168.1.102.55092 > 192.168.1.254.domain: [udp sum ok] 18530+ PTR? 254.1.168.192.in-addr.arpa. (44) 22:29:21.259891 IP (tos 0x0, ttl 64, id 86, offset 0, flags [DF], proto: TCP (6), length: 64) 192.168.1.102.58074 > www.freebsd.org.http: S, cksum 0xdcdf (correct), 2006030925:2006030925(0) win 65535 <mss 1460,nop,wscale 1,nop,nop,timestamp 854600 0,sackOK,eol> 22:29:21.341876 IP (tos 0x0, ttl 56, id 60954, offset 0, flags [DF], proto: TCP (6), length: 60) www.freebsd.org.http > 192.168.1.102.58074: S, cksum 0x6633 (correct), 722492724:722492724(0) ack 2006030926 win 57344 <mss 1408,nop,wscale 0,nop, nop,timestamp 475465274 854600> ... etc
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