[uml-user] Setting up NAT: uml can ping remote PC, but not the other way around

[ning ji <ni...@ho...>]

Hi all,
1. I run uml in linux1, ./umlinux ubda=my_rootfs mem=128M eth0=tuntap,,,192.117.0.254
2. after it boot up, i set the uml ip to be 192.117.0.7    route add default gw 192.117.0.254

3. in the linux1, i addiptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
4. linux 1 and linux 2 can ping each other5. uml and linux1 can ping each other6. uml can ping linux 27. but linux 2 cannot ping uml
pls advice what to do, thanks !