Date: Sat, 27 Apr 2002 16:32:28 -0400 From: "Joe & Fhe Barbish" <barbish@a1poweruser.com> To: "Anton Shcherbinin" <useperl@fastmail.fm> Cc: "FBSDQ" <questions@FreeBSD.ORG> Subject: RE: 1 minute delay while connecting to any host Message-ID: <LPBBIGIAAKKEOEJOLEGOOEPMCOAA.barbish@a1poweruser.com> In-Reply-To: <743669500.20020427213601@fastmail.fm>
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You left out a lot of information about your configuration, so I am taking a shot in the dark here. Your FBSD system does not know the DNS servers to query to convert the domains names into ip address. FBSD looks in the /etc/resolv.conf for the ip address of your ISP DNS. This file will be populated with the correct ip address if you tell user ppp to get and use the isp's DNS. To make this happen automatically you have to add the following to your /etc/ppp/ppp.conf file enable dns # Gets the ISP's DNS IP address & places them # in resolv.conf for reference by FBSD box. If you have this in place them you also have to allow the IPFW firewall access to the DNS services with statements like. add 00660 allow tcp from any to any 53 # allow out add 00661 allow tcp from any 53 to any # allow in add 00662 allow udp from any to any 53 # allow out add 00663 allow udp from any 53 to any # allow in -----Original Message----- From: owner-freebsd-questions@FreeBSD.ORG [mailto:owner-freebsd-questions@FreeBSD.ORG]On Behalf Of Anton Shcherbinin Sent: Saturday, April 27, 2002 1:36 PM To: freebsd-questions@freebsd.org Subject: 1 minute delay while connecting to any host This is my 1st post to this list, and I am completely new to FreeBSD. If I had better ask such questions anywhere else, please tell me the right place for this. I installed FreeBSD 4.5 Release. When my host is trying to connect to any other host specified by name, I experience a huge (1.5 minutes) delay before the hosts are connected. For example, suppose I want to get http://yahoo.com/ page. I write: $ telnet yahoo.com 80 At the same time (actually, a bit earlier), I wrote at another console as root: # tcpdump -n And here is tcpdump's output (a bit edited for clarity): 18:37:51.501962 my_host.1055 > our_DNS_server.53: 4486+ AAAA? yahoo.com. (27) 18:37:56.512212 my_host.1056 > our_DNS_server.53: 4486+ AAAA? yahoo.com. (27) 18:38:06.522353 my_host.1057 > our_DNS_server.53: 4486+ AAAA? yahoo.com. (27) 18:38:26.532655 my_host.1058 > our_DNS_server.53: 4486+ AAAA? yahoo.com. (27) 18:39:06.543281 my_host.1059 > our_DNS_server.53: 4487+ A? yahoo.com. (27) 18:39:06.683069 our_DNS_server.53 > my_host.1059: 4487* 2/5/5 A 66.218.71.113, (238) 18:39:06.683609 my_host.1028 > yahoo.com.80: S 2162865409:2162865409(0) win 65535 <mss 1460,nop,wscale 1,nop,nop,timestamp 579069 0> (DF) [tos 0x10] 18:39:06.909922 yahoo.com.80 > my_host.1028: S 2552035614:2552035614(0) ack 2162865410 win 65535 <mss 1460,nop,wscale 1,nop,nop,timestamp 66944899 579069> 18:39:06.909984 my_host.1028 > yahoo.com.80: . ack 1 win 33304 <nop,nop,timestamp 579091 66944899> (DF) [tos 0x10] That is, my host tries to resolve yahoo.com at our DNS server, *but* it looks for 'AAAA' RR, and not 'A'. It gets no reply, and in 5 seconds it retries the query (again, 'AAAA' RR). No reply again, it retries in 10 seconds, then again in 20 seconds. No reply within 40 seconds. *FINALLY*, my host asks DNS server for 'A' RR for yahoo.com . And no wonder that in several milliseconds DNS server tells my host yahoo.com's IP address. Then, within several milliseconds, my host and yahoo.com become TCP-connected. As you can see, I had to waste 5+10+20+40==75 seconds watching my host try to find nonexistent AAAA resource record. And things are the same if I try to send mail or to connect to ftp site or whatever else. What have I done wrong? What should I do? Thanks a lot for any ideas. I general, what are AAAA records? RFC1034/1035 say nothing about such RR. What TFM should I read about them? -- Anton To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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