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Another information for supplementary.
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" <pickup112@xxxxxxx> 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@xxxxxxxxxxxxxxxxxxxxxx
>Send requests to lvs-users-request@xxxxxxxxxxxxxxxxxxxxxx
>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@xxxxxxxxxxxxxxxxxxxxxx
Send requests to lvs-users-request@xxxxxxxxxxxxxxxxxxxxxx
or go to http://lists.graemef.net/mailman/listinfo/lvs-users
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