[Note I'm not subscribed to linux-net, remember to Cc: replies] Greetings, after upgrading from 2.6.8.1 to 2.6.9, my Amanda server is no longer receiving backups from its clients (except the one on its own loopback interface) although estimates succeed (tcpdump excerpt below). I am suspecting network driver trouble, as the server never sees the sendbackup packets from remote clients and tcpdump logs a bad udp checksum (which, I believe, causes Linux to discard the packet) in 2.6.9, but "udp sum ok" and working backup in 2.6.8.1, 2.6.7 and SuSE's 2.6.5-7.108-default. Hardware: server uses amanda 2.4.4p2 and these cards eth0 - 3Com 3c900 Combo (Boomerang) with 10Base2 Coax/BNC to client A eth1 - 3Com 3c905 100BaseTX (Boomerang) with 10BaseT HD to DSL modem eth2 - 3Com 3c905 100BaseTX (Boomerang) with 100BaseTX FD to client B eth3 - VIA VT6102 (Rhine-II), unconnected br0 bridges eth0 and eth2, with net.bridge.bridge-nf-call-iptables = 0. client A uses a 3Com 3C900B-Combo and Linux 2.6.5 client B uses an Intel 82550 Pro/100 Ethernet and FreeBSD 4.10-RELEASE-p3 Has the 3c59x driver changed between 2.6.8.1 and 2.6.9? Which patches or changesets are worth backing out? Any directions for debugging? Here are tcpdumps, taken on the server with -ibr0, client is connected to eth0, the "Combo" card. The client was unchanged between the server reboots: Linux 2.6.9: 20:11:47.529071 IP (tos 0x0, ttl 64, id 27, offset 0, flags [DF], length: 153) 192.168.0.48.10080 > 192.168.0.1.985: [bad udp cksum a00!] UDP, length: 125 0x0000 4500 0099 001b 4000 4011 b8b7 c0a8 0030 E.....@.@......0 0x0010 c0a8 0001 2760 03d9 0085 b9ec 416d 616e ....'`......Aman 0x0020 6461 2032 2e34 2052 4550 2048 414e 444c da.2.4.REP.HANDL 0x0030 4520 3030 302d 4630 4241 3038 3038 2053 E.000-F0BA0808.S 0x0040 4551 2031 3039 3832 3935 3634 360a 434f EQ.1098295646.CO 0x0050 4e4e 4543 5420 4441 5441 2033 3238 3830 NNECT.DATA.32880 0x0060 204d 4553 4720 3332 3838 3120 494e 4445 .MESG.32881.INDE 0x0070 5820 3332 3838 3200 4f50 5449 4f4e 5320 X.32882.OPTIONS. 0x0080 6665 6174 7572 6573 3d66 6666 6666 6566 features=fffffef 0x0090 6639 6666 6530 663b 0a f9ffe0f;. Linux 2.6.8.1: 20:48:25.880812 IP (tos 0x0, ttl 64, id 51, offset 0, flags [DF], length: 153) 192.168.0.48.10080 > 192.168.0.1.706 [udp sum ok] UDP, length: 125 0x0000 4500 0099 0033 4000 4011 b89f c0a8 0030 E....3@.@......0 0x0010 c0a8 0001 2760 02c2 0085 b90c 416d 616e ....'`......Aman 0x0020 6461 2032 2e34 2052 4550 2048 414e 444c da.2.4.REP.HANDL 0x0030 4520 3030 302d 4630 4241 3038 3038 2053 E.000-F0BA0808.S 0x0040 4551 2031 3039 3832 3937 3933 340a 434f EQ.1098297934.CO 0x0050 4e4e 4543 5420 4441 5441 2033 3239 3133 NNECT.DATA.32913 0x0060 204d 4553 4720 3332 3931 3420 494e 4445 .MESG.32914.INDE 0x0070 5820 3332 3931 350a 4f50 5449 4f4e 5320 X.32915.OPTIONS. 0x0080 6665 6174 7572 6573 3d66 6666 6666 6566 features=fffffef 0x0090 6639 6666 6530 663b 0a f9ffe0f;. -- Matthias Andree - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
