Additional info:
Both vlans: virtual server Vlan and servers vlan are in the same physical interface in trunk mode (tagged mode).
tcpdump result:
cpena@(F2000S-SBD1-00A-CORE-C1U1)(cfg-sync In Sync)(Active)(/Common)(tmos) tcpdump -ni /Common/external_db_67 -c 50 host 11.240.67.38 and port 3753
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on /Common/external_db_67, link-type EN10MB (Ethernet), capture size 96 bytes
09:21:54.994844 IP 11.240.67.101.34715 > 11.240.67.38.nattyserver: S 2214683657:2214683657(0) win 14600
09:21:54.995068 IP 11.240.67.38.nattyserver > 11.240.67.101.34715: S 3868166173:3868166173(0) ack 2214683658 win 8192
09:21:54.995214 IP 11.240.67.101.34715 > 11.240.67.38.nattyserver: . ack 1 win 115
09:21:54.995298 IP 11.240.67.101.34715 > 11.240.67.38.nattyserver: F 1:1(0) ack 1 win 115
09:21:54.995436 IP 11.240.67.38.nattyserver > 11.240.67.101.34715: R 1:1(0) ack 2 win 0
09:21:59.900387 IP 11.240.67.101.43366 > 11.240.67.38.nattyserver: S 1557140346:1557140346(0) win 14600
09:21:59.900641 IP 11.240.67.38.nattyserver > 11.240.67.101.43366: S 1096300115:1096300115(0) ack 1557140347 win 8192
09:21:59.900731 IP 11.240.67.101.43366 > 11.240.67.38.nattyserver: . ack 1 win 115
09:21:59.900814 IP 11.240.67.101.43366 > 11.240.67.38.nattyserver: F 1:1(0) ack 1 win 115
09:21:59.900952 IP 11.240.67.38.nattyserver > 11.240.67.101.43366: R 1:1(0) ack 2 win 0
09:22:04.906414 IP 11.240.67.101.de-server > 11.240.67.38.nattyserver: S 4221153083:4221153083(0) win 14600 09:22:04.906681 IP 11.240.67.38.nattyserver > 11.240.67.101.de-server: S 4107155638:4107155638(0) ack 4221153084 win 8192
09:22:04.906827 IP 11.240.67.101.de-server > 11.240.67.38.nattyserver: . ack 1 win 115
09:22:04.906919 IP 11.240.67.101.de-server > 11.240.67.38.nattyserver: F 1:1(0) ack 1 win 115
09:22:04.907065 IP 11.240.67.38.nattyserver > 11.240.67.101.de-server: R 1:1(0) ack 2 win 0
09:22:09.911745 IP 11.240.67.101.34831 > 11.240.67.38.nattyserver: S 143087439:143087439(0) win 14600
09:22:09.911969 IP 11.240.67.38.nattyserver > 11.240.67.101.34831: S 3510124486:3510124486(0) ack 143087440 win 8192
09:22:09.912113 IP 11.240.67.101.34831 > 11.240.67.38.nattyserver: . ack 1 win 115
09:22:09.912199 IP 11.240.67.101.34831 > 11.240.67.38.nattyserver: F 1:1(0) ack 1 win 115