Hi, When I enable dummynet rules, default router changes unexpectedly. If the pipe & queue rules not exists, there is no problem. I tried all FreeBSD 7.1, 7.2, 7.3, 8.1-STABLE-201008 releases ( both i386 and amd64 ). All this FreeBSD versions are affected.
I inspected logs if someone logged in or changed route (with route -n monitor command). When the default route changed, there isnt any messages at the "route -n monitor" command output. I think there can be a buffer overflow in dummynet code. This problem repeats once per 10 minute. I wrote a shell script which monitors the default router. I saw that sometimes netstat -rn shows that default router is changed as 10.0.16.251 or 10.6.10.240 etc. which are client IP addresses but routing still routes to right router 193.X.Y.Z . After a while, routing really fails. You can access tcpdump capture file from: http://193.255.128.30/~ryland/flowdata_10_0_16_251 This file captured while the default router changes. Tcpdump capture, belongs to the IP Address which shown in default router (10.0.16.251) the tcpdump command: tcpdump -w /home/flowdata_10_0_16_251 -ni bce0.116 host 10.0.16.251 dummynet rules are: 30000 pipe 3 tcp from 10.0.0.0/8,192.168.0.0/16,172.16.0.0/12 to any dst-port 8000,80,22,25,88,110,443,1720,1863,1521,3389,4489 via em0 // Upload 30000 pipe 3 udp from 10.0.0.0/8,192.168.0.0/16,172.16.0.0/12 to any dst-port 53 via em0 // Upload 30000 pipe 4 tcp from 10.0.0.0/8,192.168.0.0/16,172.16.0.0/12 to any via em0 // Upload 30000 pipe 4 udp from 10.0.0.0/8,192.168.0.0/16,172.16.0.0/12 to any via em0 // Upload .... LOTS OF NAT RULES HERE (in kernel nat) 60000 pipe 1 tcp from any 8000,80,22,25,88,110,443,1720,1863,1521,3389,4489 to 10.0.0.0/8,192.168.0.0/16,172.16.0.0/12 via bce0* // Download 60000 pipe 1 udp from any 53 to 10.0.0.0/8,192.168.0.0/16,172.16.0.0/12 via bce0* // Download 60000 pipe 2 tcp from any to 10.0.0.0/8,192.168.0.0/16,172.16.0.0/12 via bce0* // Download 60000 pipe 2 udp from any to 10.0.0.0/8,192.168.0.0/16,172.16.0.0/12 via bce0* // Download /sbin/ipfw pipe 1 config bw 8192Kbit/s mask dst-ip 0xffffffff /sbin/ipfw pipe 3 config bw 1024Kbit/s mask src-ip 0xffffffff /sbin/ipfw pipe 2 config bw 4096Kbit/s mask dst-ip 0xffffffff /sbin/ipfw pipe 4 config bw 1024Kbit/s mask src-ip 0xffffffff sysctl vars: net.inet.ip.dummynet.hash_size=256 ( also tried with 8192 ) net.inet.ip.dummynet.pipe_slot_limit=500 net.inet.ip.dummynet.io_fast=1 Some Information about network: System has 3 NICS as WAN, LAN, DMZ. There are VLANs on WAN and LAN interfaces Throuput between 20Mbps and 100Mbps. Any ideas? Regards, Ozkan KIRIK Mersin University @ Turkey _______________________________________________ freebsd-ipfw@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-ipfw To unsubscribe, send any mail to "freebsd-ipfw-unsubscr...@freebsd.org"
