Date: Wed, 30 Nov 2005 13:56:29 +0000 From: Spadge <spadge@fromley.net> To: freebsd-net@freebsd.org Subject: frequent internet death in FreeBSD 6 - no idea why. Message-ID: <438DAF8D.9030705@fromley.net>
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Hi all.
I must admit to being completely stumped by this prooblem I am having
with my FreeBSD 6 internet gateway. I don't even know where to start
trying to troubleshoot it.
The symptoms are: every now and then, usually (but not always) when I
try to open a web page (using a client machine further down the NATed
network) the browser sits there not opening anything and eventually
errors out. While this happens, the gateway computer drops its
connection to the internet completely, the cable modem's "cable" light
goes out, starts flashing and goes back on again as if I had just
unplugged the cable. Everything on the NAT side of the gateway
disconnects from the internet, usually (multiple chat protocols, web
browsing). Rarely, things on the gateway disconnect from the internet
(ircd).
I am trying to remember when this started happening, or when I noticed
it at least (I am guessing they were around the same time) and it seems
to me that it was around the time I had a pretty serious OS hang-up over
some HDD 'setfeatures set transfer mode semaphore timeout' problem that
caused a complete system lockup which required a hard reboot (physical
button pushing). The HDD that was causing the problem was not the system
disk, so all the data I am aware of having lost was just that: non
OS-essential data.
As I say, I am really stuck here. I have tried swapping out NICs,
changing WAN for LAN, putting the cards in different PCI slots,
rebuilding world/kernel with dummynet, rebuilding world/kernel without
dummynet. I am at a loss as to what to try to do next. How do I go about
finding out what's causing the problem so that I can try fixing it?
spadge@tobermory$ uname -a
FreeBSD tobermory.home 6.0-RELEASE FreeBSD 6.0-RELEASE #2: Wed Nov 30
02:19:31 GMT 2005 root@tobermory.home:/usr/obj/usr/src/sys/TOBERMORY
i386
spadge@tobermory$ diff /usr/src/sys/i386/conf/GENERIC
/usr/src/sys/i386/conf/TOBERMORY
66c66,80
< device apic # I/O APIC
---
> # To make an SMP kernel, the next two are needed
> options SMP # Symmetric MultiProcessor Kernel
> device apic # I/O APIC
>
> # For ipfw/natd
>
> options IPFIREWALL
> options IPDIVERT
> options IPFIREWALL_DEFAULT_TO_ACCEPT
> options IPFIREWALL_VERBOSE
>
> # For DUMMYNET packet shaping
> # options DUMMYNET
> # options HZ=1000
>
spadge@tobermory$ ifconfig xl0
xl0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
options=8<VLAN_MTU>
inet6 fe80::260:8ff:fe79:bcdb%xl0 prefixlen 64 scopeid 0x1
inet 192.168.124.199 netmask 0xffffff00 broadcast 192.168.124.255
ether 00:60:08:79:bc:db
media: Ethernet autoselect (100baseTX <full-duplex>)
status: active
spadge@tobermory$ ifconfig xl1
xl1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
options=9<RXCSUM,VLAN_MTU>
inet6 fe80::250:4ff:fee9:114c%xl1 prefixlen 64 scopeid 0x2
inet 82.18.8.27 netmask 0xffffff00 broadcast 255.255.255.255
ether 00:50:04:e9:11:4c
media: Ethernet autoselect (10baseT/UTP)
status: active
Running ipfw/nated/named/bind. DHCP client to the WAN side, fixed IPs on
the LAN side.
Not sure what further information is required.
If there's anyone who could help shed some light on this problem, how to
troubleshoot it etc, please please please do write back, I am at my
wit's end here.
Thanks.
--
Spadge
"Intoccabile"
www.fromley.com
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