Re: Re: Re: Re: trouble about IP Fragmentation by using the Linux Virtual Server

[<frederic.buche@xxxxxxxxxx>]

Hello ,

I have set up the second patch you gave me (csum2.diff) . It is still correct.
As you told me, I consider that I can put this patch on my system, and I expect to get the patch inside the next release of IPVS.
Could you tell me in a few words what was the trouble ? I just see into the patch that you force ip_send_check(iph) to be done;
Thank you very much.

Tcpdump's logs :

[root@ginlbc212b /]# tcpdump -vvv -s 2000 -n host 195.101.125.28
tcpdump: listening on eth0

14:10:51.563097 195.101.125.28.19678 > 195.6.241.14.smtp: S [tcp sum ok] 71967:71967(0) win 8192 <mss 1460> (DF) [tos 0x10]  (ttl 124, id 20285, len 44)
14:10:51.563154 195.101.125.28.19678 > 195.6.241.14.smtp: S [tcp sum ok] 71967:71967(0) win 8192 <mss 1460> (DF) [tos 0x10]  (ttl 124, id 20285, len 44)
14:10:51.656721 195.101.125.28.19678 > 195.6.241.14.smtp: . [tcp sum ok] 71968:71968(0) ack 564660427 win 8760 (DF) [tos 0x10]  (ttl 124, id 20541, len 40)
14:10:51.656740 195.101.125.28.19678 > 195.6.241.14.smtp: . [tcp sum ok] 0:0(0) ack 1 win 8760 (DF) [tos 0x10]  (ttl 124, id 20541, len 40)
14:10:51.802060 195.101.125.28.19678 > 195.6.241.14.smtp: P [tcp sum ok] 0:16(16) ack 114 win 8647 (DF) [tos 0x10]  (ttl 124, id 21053, len 56)
14:10:51.802079 195.101.125.28.19678 > 195.6.241.14.smtp: P [tcp sum ok] 0:16(16) ack 114 win 8647 (DF) [tos 0x10]  (ttl 124, id 21053, len 56)
14:10:51.927003 195.101.125.28.19678 > 195.6.241.14.smtp: P [tcp sum ok] 16:45(29) ack 157 win 8604 (DF) [tos 0x10]  (ttl 124, id 21309, len 69)
14:10:51.927023 195.101.125.28.19678 > 195.6.241.14.smtp: P [tcp sum ok] 16:45(29) ack 157 win 8604 (DF) [tos 0x10]  (ttl 124, id 21309, len 69)
14:10:52.047244 195.101.125.28.19678 > 195.6.241.14.smtp: P [tcp sum ok] 45:82(37) ack 190 win 8571 (DF) [tos 0x10]  (ttl 124, id 21565, len 77)
14:10:52.047263 195.101.125.28.19678 > 195.6.241.14.smtp: P [tcp sum ok] 45:82(37) ack 190 win 8571 (DF) [tos 0x10]  (ttl 124, id 21565, len 77)
14:10:52.157649 195.101.125.28.19678 > 195.6.241.14.smtp: P [tcp sum ok] 82:88(6) ack 234 win 8527 (DF) [tos 0x10]  (ttl 124, id 21821, len 46)
14:10:52.157666 195.101.125.28.19678 > 195.6.241.14.smtp: P [tcp sum ok] 82:88(6) ack 234 win 8527 (DF) [tos 0x10]  (ttl 124, id 21821, len 46)
14:10:52.709739 195.101.125.28.19678 > 195.6.241.14.smtp: . [bad tcp cksum 9749!] 88:1516(1428) ack 295 win 8466 (frag 22077:1448@0+) [tos 0x10]  (ttl 124, len 1468)
14:10:52.709742 195.101.125.28 > 195.6.241.14: (frag 22077:32@1448) [tos 0x10]  (ttl 124, len 52)
14:10:52.709795 195.101.125.28.19678 > 195.6.241.14.smtp: . [tcp sum ok] 88:1548(1460) ack 295 win 8466 [tos 0x10]  (ttl 124, id 22077, len 1500)
14:10:52.710249 195.101.125.28.19678 > 195.6.241.14.smtp: P [tcp sum ok] 1548:1893(345) ack 295 win 8466 (DF) [tos 0x10]  (ttl 124, id 22333, len 385)
14:10:52.710267 195.101.125.28.19678 > 195.6.241.14.smtp: P [tcp sum ok] 1548:1893(345) ack 295 win 8466 (DF) [tos 0x10]  (ttl 124, id 22333, len 385)
14:10:52.838781 195.101.125.28.19678 > 195.6.241.14.smtp: P [tcp sum ok] 1893:1898(5) ack 295 win 8466 (DF) [tos 0x10]  (ttl 124, id 22589, len 45)
14:10:52.838800 195.101.125.28.19678 > 195.6.241.14.smtp: P [tcp sum ok] 1893:1898(5) ack 295 win 8466 (DF) [tos 0x10]  (ttl 124, id 22589, len 45)
14:10:52.954840 195.101.125.28.19678 > 195.6.241.14.smtp: P [tcp sum ok] 1898:1904(6) ack 351 win 8410 (DF) [tos 0x10]  (ttl 124, id 22845, len 46)
14:10:52.954858 195.101.125.28.19678 > 195.6.241.14.smtp: P [tcp sum ok] 1898:1904(6) ack 351 win 8410 (DF) [tos 0x10]  (ttl 124, id 22845, len 46)
14:10:53.079951 195.101.125.28.19678 > 195.6.241.14.smtp: F [tcp sum ok] 1904:1904(0) ack 405 win 8356 (DF) [tos 0x10]  (ttl 124, id 23101, len 40)
14:10:53.079972 195.101.125.28.19678 > 195.6.241.14.smtp: F [tcp sum ok] 1904:1904(0) ack 405 win 8356 (DF) [tos 0x10]  (ttl 124, id 23101, len 40)
14:10:53.092784 195.101.125.28.19678 > 195.6.241.14.smtp: . [tcp sum ok] 1905:1905(0) ack 406 win 8356 (DF) [tos 0x10]  (ttl 124, id 23357, len 40)
14:10:53.092802 195.101.125.28.19678 > 195.6.241.14.smtp: . [tcp sum ok] 1905:1905(0) ack 406 win 8356 (DF) [tos 0x10]  (ttl 124, id 23357, len 40)



Frédéric BUCHE
mailto : frederic.buche@xxxxxxxxxx