Upon upgrading from 7.0-release to 8.0-RC3 the fxp0 interface came with rxcsum enabled, eg: # ifconfig fxp0 fxp0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500 options=9<RXCSUM,VLAN_MTU> ether 00:20:fc:1e:dd:00 inet 61.120.147.50 netmask 0xfffffffc broadcast 61.120.147.51 inet6 fe80::220:fcff:fe1e:dd00%fxp0 prefixlen 64 scopeid 0x1 media: Ethernet 100baseTX <full-duplex> status: active # sysctl -a | grep fxp dev.fxp.0.%desc: Intel 82559ER Embedded 10/100 Ethernet dev.fxp.0.%driver: fxp dev.fxp.0.%location: slot=4 function=0 dev.fxp.0.%pnpinfo: vendor=0x8086 device=0x1209 subvendor=0x102b subdevice=0x6000 class=0x020000 dev.fxp.0.%parent: pci3 dev.fxp.0.int_delay: 1000 dev.fxp.0.bundle_max: 6 dev.fxp.0.rnr: 0 dev.fxp.0.noflow: 1 This caused truncated IP packets/messages to be received by the kernel resulting in the machine being unreachable. # tcpdump -n -i fxp0 -c 3 -s0 fxp0: promiscuous mode enabled tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on fxp0, link-type EN10MB (Ethernet), capture size 65535 bytes 01:52:48.166315 IP truncated-ip - 2 bytes missing! 204.42.254.133 > 61.120.147.50: ICMP echo request, id 33313, seq 5139, length 64 01:52:49.166155 IP truncated-ip - 2 bytes missing! 204.42.254.133 > 61.120.147.50: ICMP echo request, id 33313, seq 5140, length 64 01:52:50.166276 fIP truncated-ip x- 2 bytes missinpg! 204.42.254.1303 > 61.120.147.5:0: ICMP echo req uest, id 33313, pseq 5141, lengthr 64 3 packets coaptured 3 packemts received by fiilter 0 packetss dropped by kerncel uous mode disabled Fix: ifconfig fxp0 -rxcsum How-To-Repeat: Reboot the system with this hardware installed/used.
Responsible Changed From-To: freebsd-bugs->freebsd-net Over to maintainer(s).
State Changed From-To: open->feedback I belive the fix was committed to HEAD(r197586) and MFCed to stable/8 and stable7 but it didn't make it into 8.0-RELEASE. To workaound the issue you can disable Rx checksum offload of fxp0. #ifconfig fxp0 -rxcsum Or download patch from the following URL. http://svn.freebsd.org/viewvc/base/head/sys/dev/fxp/if_fxp.c?r1=197586&r2=197575&view=patch
Responsible Changed From-To: freebsd-net->yongari Track.
State Changed From-To: feedback->closed feedback timed out(> 3 months). The fix was already MFCed to stable/8 and stable/7.