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I config the LVS as DR mode like this: ``` ipvsadm -A -t 158.222.165.185:3306 -s wrr ipvsadm -a -t 158.222.165.185:3306 -r 158.222.165.125:3306 -g -w 100 ``` And I have not config net.ipv4.ip_forward = 1 accord to http://www.austintek.com/LVS/LVS-HOWTO/HOWTO/LVS-HOWTO.LVS-DR.html But if I config "net.ipv4.ip_forward = 1 ", there are no package fragment. MySQL connect to mysqld successfully. 在 2017-07-04 20:50:24，"Pickup.Li" <pickup...@163.com> 写道： >I have meet a very strange problem in my LVS environment. > > >when I connect to mysqld real server, mysql client is ok. >when I connect to LVS to access to the real server, mysql client report error. > > > >And I have tcpdump the package on the LVS and real server. >Sync/Sync+ack/ack of Three-way Handshake is ok，and four-way handshake is ok. >But when mysql client send the login request (user/password) package, the >package fragment. > > >As show as follows,The LVS received the package and send it the real server >correct(length 252). >But real server get a fragment of the package (length 248) and a error chksum. >It have missed the 4 bytes fragment of the package. > > >Here is the package I have ```tcpdump -lnnneeevvv``` on the LVS. >* 9c:dc:71:4d:49:d0 = 158.222.165.126 is the client >* 24:8a:07:64:7f:21 = 158.222.165.185 is the VIP and the director >* 24:8a:07:64:56:41 = 158.222.165.185 is the real server > > >LVS package: >``` >19:12:22.229356 9c:dc:71:4d:49:d0 > 24:8a:07:64:7f:21, ethertype IPv4 >(0x0800), length 252: (tos 0x8, ttl 64, id 56669, offset 0, flags [DF], proto >TCP (6), l > 158.222.165.126.37691 > 158.222.165.185.3306: Flags [P.], cksum 0x5d97 > (correct), seq 0:198, ack 83, win 115, length 198 >19:12:22.229367 24:8a:07:64:7f:21 > 24:8a:07:64:56:41, ethertype IPv4 >(0x0800), length 252: (tos 0x8, ttl 64, id 56669, offset 0, flags [DF], proto >TCP (6), l > 158.222.165.126.37691 > 158.222.165.185.3306: Flags [P.], cksum 0x5d97 > (correct), seq 0:198, ack 83, win 115, length 198 >``` > > >real server packages: >``` >19:12:21.803118 24:8a:07:64:7f:21 > 24:8a:07:64:56:41, ethertype IPv4 >(0x0800), length 248: (tos 0x8, ttl 64, id 56668, offset 0, flags [DF], proto >TCP (6), l > 158.222.165.126.37691 > 158.222.165.185.3306: Flags [.], cksum 0x5d97 > (incorrect -> 0x4883), seq 1:195, ack 83, win 115, length 194 >19:12:21.803126 24:8a:07:64:7f:21 > 24:8a:07:64:56:41, ethertype IPv4 >(0x0800), length 60: (tos 0x8, ttl 64, id 56669, offset 0, flags [DF], proto >TCP (6), le > 158.222.165.126.37691 > 158.222.165.185.3306: Flags [P.], cksum 0x7973 > (incorrect -> 0x5fb3), seq 199, ack 83, win 115, length 0 >``` > > > >* we run the test on rhel6.7 with ipvsadm v1.26 2008/5/15 (compiled with popt >and IPVS v1.2.1) >* our network engineer have mirror the port of LVS and report that the package >is fragmented from LVS director. >* we have replace the broadcom network card to intel netword card, but it >still the same problem > > >Have any one meet the problem, do you resolve it ? Or any one can help to fix >it. >_______________________________________________ >Please read the documentation before posting - it's available at: >http://www.linuxvirtualserver.org/ > >LinuxVirtualServer.org mailing list - lvs-users@LinuxVirtualServer.org >Send requests to lvs-users-requ...@linuxvirtualserver.org >or go to http://lists.graemef.net/mailman/listinfo/lvs-users _______________________________________________ Please read the documentation before posting - it's available at: http://www.linuxvirtualserver.org/ LinuxVirtualServer.org mailing list - lvs-users@LinuxVirtualServer.org Send requests to lvs-users-requ...@linuxvirtualserver.org or go to http://lists.graemef.net/mailman/listinfo/lvs-users
