Date: Mon, 1 May 2000 08:32:29 -0700 From: Brent Kearney <brent@dcfonline.sfu.ca> To: questions@freebsd.org Subject: network problems Message-ID: <20000501083229.A12827@dcfonline.sfu.ca>
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I'm having a strange problem with a FreeBSD 3.4-STABLE box: occasionally
(every other day or so - randomly) I seem to loose almost all network access.
It seems as though there is no access to DNS; I cannot get a
connection to any external sites. However, clients on the "inside" of the
multihomed system (2 NICs, one to a cable modem, the other to a shared
hub) have no problem with DNS, or with connecting to external sites (ftp,
http, ssh). The problem seems to disappear after 2-5 hours, and then
reappear in a day or two. During this time, I get no email to/from the
box, external users cannot connect, ntpdate cannot connect anywhere, and
connections that were active before the problem comes on stay connected
for another 10-20 minutes. Then they time out.
I'm using my ISPs DNS servers (on all of the computers on the LAN), and a
couple of others at the end of my resolve.conf. I tried restarting routed
and natd, it made no difference. Here's some relevent info (IPs changed
to protect the innocent):
(root) (/etc) ifconfig -a
pn0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1366
inet 24.113.XX.XXX netmask 0xfffffc00 broadcast 24.113.XX.255
ether 00:a0:cc:22:33:f1
media: 10baseT/UTP <half-duplex>
supported media: autoselect 100baseTX <full-duplex> 100baseTX
<half-duplex> 100baseTX 10baseT/UTP <full-duplex> 10baseT/UTP
10baseT/UTP <half-duplex>
pn1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
inet 192.168.X.1 netmask 0xffffff00 broadcast 192.168.X.255
ether 00:a0:cc:21:4a:30
media: 100baseTX <half-duplex>
supported media: autoselect 100baseTX <full-duplex> 100baseTX
<half-duplex> 100baseTX 10baseT/UTP <full-duplex> 10baseT/UTP
10baseT/UTP <half-duplex>
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
inet 127.0.0.1 netmask 0xff000000
ppp0: flags=8010<POINTOPOINT,MULTICAST> mtu 1500
tun0: flags=8050<POINTOPOINT,RUNNING,MULTICAST> mtu 1500
(root) (/etc) netstat -a
Active Internet connections (including servers)
Proto Recv-Q Send-Q Local Address Foreign Address (state)
icmp 0 0 *.* *.*
icmp 0 0 *.* *.*
tcp 0 0 Academy.smtp 207.194.XXX.198.4205 SYN_RCVD
tcp 0 0 Academy.ssh 142.XX.107.4.1018 SYN_RCVD
tcp 0 0 Academy.smtp 142.XX.120.21.52665 SYN_RCVD
tcp 0 0 Academy.smtp 207.194.XXX.198.4200 SYN_RCVD
tcp 0 0 *.6002 *.* LISTEN
tcp 0 0 192.168.X.1.ssh Plato.688 ESTABLISHED
tcp 0 0 *.6001 *.* LISTEN
tcp 0 0 192.168.X.1.ssh Plato.988 ESTABLISHED
tcp 0 0 Academy.3364 207.79.XX.11.6667 ESTABLISHED
tcp 0 0 *.966 *.* LISTEN
tcp 0 0 *.socks *.* LISTEN
tcp 0 0 *.netbios-ssn *.* LISTEN
tcp 0 0 *.auth *.* LISTEN
tcp 0 0 *.ssh *.* LISTEN
tcp 0 0 *.smtp *.* LISTEN
tcp 0 0 *.http *.* LISTEN
tcp 0 0 *.printer *.* LISTEN
tcp 0 0 *.pop3 *.* LISTEN
tcp 0 0 *.time *.* LISTEN
tcp 0 0 *.telnet *.* LISTEN
tcp 0 0 *.ftp *.* LISTEN
tcp 0 0 *.1022 *.* LISTEN
tcp 0 0 *.nfsd *.* LISTEN
tcp 0 0 *.1023 *.* LISTEN
tcp 0 0 *.sunrpc *.* LISTEN
udp 0 0 *.router *.*
udp 0 0 *.2063 *.*
udp 0 0 *.837 *.*
udp 0 0 *.3607 *.*
udp 0 0 192.168.X.1.netbios-d *.*
udp 0 0 192.168.X.1.netbios-n *.*
udp 0 0 *.netbios-dgm *.*
udp 0 0 *.netbios-ns *.*
udp 0 0 *.time *.*
udp 0 0 *.talk *.*
udp 0 0 *.ntalk *.*
udp 0 0 *.biff *.*
udp 0 0 *.1008 *.*
udp 0 0 *.nfsd *.*
udp 0 0 *.1020 *.*
udp 0 0 *.sunrpc *.*
udp 0 0 *.syslog *.*
Active UNIX domain sockets
Address Type Recv-Q Send-Q Inode Conn Refs Nextref Addr
c313b7c0 stream 0 0 0 c313b6c0 0 0
c313b6c0 stream 0 0 0 c313b7c0 0 0
c313b8c0 stream 0 0 0 c313bdc0 0 0
c313bdc0 stream 0 0 0 c313b8c0 0 0
c313be40 stream 0 0 0 c313be00 0 0
c313be00 stream 0 0 0 c313be40 0 0
c313b700 stream 0 0 0 c313b780 0 0
c313b780 stream 0 0 0 c313b700 0 0
c313b940 stream 0 0 0 c313bcc0 0 0
c313bcc0 stream 0 0 0 c313b940 0 0
c313b680 stream 0 0 c32f2500 0 0 0 /home/brent/tmp/99141.ttyp0.Aca
demy
c313bec0 stream 0 0 c3135540 0 0 0 /var/run/printer
c313bb80 dgram 0 0 0 c313bfc0 0 c313bc00
c313bc00 dgram 0 0 0 c313bfc0 0 c313b640
c313b640 dgram 0 0 0 c313bfc0 0 c313b740
c313b740 dgram 0 0 0 c313bfc0 0 c313bc40
c313bc40 dgram 0 0 0 c313bfc0 0 c313bd00
c313bd00 dgram 0 0 0 c313bfc0 0 c313bd40
c313bd40 dgram 0 0 0 c313bfc0 0 c313bd80
c313bd80 dgram 0 0 0 c313bfc0 0 c313be80
c313be80 dgram 0 0 0 c313bfc0 0 c313bf00
c313bf00 dgram 0 0 0 c313bfc0 0 c313bf40
c313bf40 dgram 0 0 0 c313bfc0 0 c313bf80
c313bf80 dgram 0 0 0 c313bfc0 0 0
c313bfc0 dgram 0 0 c3138600 0 c313bb80 0 /var/run/log
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