System Freeze w/ IPNAT
ted at ness.plymouth.edu
Mon Nov 19 12:13:06 PST 2007
We have a box doing routing and NAT using IPNAT that freezes up after a couple
days. We have swapped out the Box with a different model and continue to
see the same problem. Symptoms are that the machine no longer passes
traffic and the console is unresponsive to any keyboard input (not even
ctrl-alt-del). What we are doing is just Nat'ing a portion of the network
traffic (we want to pass certain areas of the network address space
un-modified). We are pretty certain that our problem has something to do
with ipnat becasue we are using other BSD boxes as routers without issue.
We have seen a couple:
bge1: watchdog timeout -- resetting
bge1: link state changed to DOWN
bge1: link state changed to UP
in the log file that were not present on the first machine because it had a
different set of network cards... I mention it only for completeness.
Any help that someone can provide would be appreciated. Additional pertinent
info is provided below.
Relevant Kernel Options:
options IPFILTER #ipfilter support
options IPFILTER_LOG #ipfilter logging
options IPFILTER_LOOKUP #ipfilter pools
Relevant rc.conf settings:
# Network firewall / NAT (IPF)
ipfilter_flags="-T ipf_nattable_max=500000 -E"
ipmon_flags="-Ds -N /dev/ipnat -f /dev/ipl -S /dev/ipstate"
Example rule from /etc/ipnat.rules (we have a number of these based on areas
of our network)... Each subnet is associated with a different ip on the
outgoing side of the NAT.
map bge0 192.168.100.0/23 -> 192.168.4.64/32 proxy port ftp ftp/tcp
map bge0 192.168.100.0/23 -> 192.168.4.64/32 icmpidmap icmp 60000:65535
map bge0 192.168.100.0/23 -> 192.168.4.64/32 portmap tcp/udp 42000:65535
FreeBSD 6.2 pl-8
Using Dell Poweredge 860
1 Gig RAM
Dual - Broadcom BCM5750 B1, ASIC rev. 0x4101
First Interface (bge0):
with 11 IP's (1 for host with 10 aliases for NAT) operating at media:
Ethernet autoselect (1000baseTX <full-duplex>)
Second interface (bge1):
with one IP operating at media: Ethernet autoselect (1000baseTX
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