I have been experiencing problems running a nfs server and iptables on
the same machine.The problem was also reported almost a year ago by Paul
Raines on the netfilter mailing list
http://lists.netfilter.org/pipermail/netfilter/2002-January/030002.html
but it seems no solution has been found yet.
The problem is this: A machine running linux 2.4.18 or 2.4.19 works just
fine when running just the kernel nfsd. A single client connected to the
server with 100Mbit ethernet sees throughput of 5-10MByte/sec even after
an hour or two of continous transfers. If the nfs server is also running
iptables the throughput is initially the same (5-10MByte/sec) but after
a while (200MByte-500MByte total transfer) the client starts reporting
"nfs server not responding" followed after a while by "nfs server OK"
and of course the transfer rate goes way down (< 1MByte/sec). Using
tcpdump on the client seems to indicate that some packets have their
headers garbled - wrong fragment ids being the typical error.
Having iptables compiled as modules and simply loading or unloading the
ipt_conntrack module is
sufficient for causing/removing the problem. Having iptables support
compiled into the kernel causes the problem allways.
The problem has been verified on 4 different machines with a variety of
different ethernet cards. In
all cases the network continues to work without problems for all other
types of traffic - i.e a telnet connection from client to server works
with no delay and a ftp transfer goes at >5MByte/sec even when nfs
throughput is suffering.
\Lars Knudsen
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This archive was generated by hypermail 2b29 : Sat Nov 23 2002 - 22:00:43 EST