How to change iptables rule?

Question

bash

Colleagues, please help me change the rule
SNAT all -- 10.8.0.0/24 !10.8.0.0/24 to:XXXX
to
SNAT all -- 10.8.0.0/24 !10.8.0.0/24 to:YYYY

#  iptables --table nat --list
Chain PREROUTING (policy ACCEPT)
target     prot opt source               destination

Chain INPUT (policy ACCEPT)
target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

Chain POSTROUTING (policy ACCEPT)
target     prot opt source               destination
SNAT       all  --  10.8.0.0/24         !10.8.0.0/24          to:X.X.X.X
MASQUERADE  all  --  192.168.2.0/24       anywhere

Answer 1

iptables -t nat -D POSTROUTING 1
iptables -t nat -I POSTROUTING -p all -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to-source Y.Y.Y.Y

Answer 2

iptables-save -f rules.v4
vi rules.v4
iptables-restore rules.v4

man iptables-save/restore won't hurt.