LVS

List used fwmarks

iptables -t mangle -L PREROUTING -n | awk -F "MARK set " '{print $2}' | sort -u

List all virtual servers with fwmarks in a given subnet

for x in `iptables-save | grep 10.8.28 | awk '{print $NF}' | awk -F / '{print $1}'`; do ipvsadm -lnf $(($x)) | cat -n; done

Change the weight for a real server

ipvsadm -ef 123 -r 10.0.0.23:0 -w 0