hi there,
1.26 is needed to use new features of the kernel-2.6.37 or better.
The ipvsadm-1.26 was released on February 8, 2011, for handling with the new
features in IPVS such as SCTP support, one-packet scheduling, and SIP
persistent engine, and also fixing some bugs.
https://bugzilla.redhat.com/show_bug.cgi?id=676167
-thanks-