mobileip / netfilter
Tue, 1 Jan 2002 06:33:01 -0800 (PST)
i have a basic doubt as to the use of DNAT rules to simulate mobile ip
behaviour. i am very new to this , so please tolerate/explain glaring
* host `home.netfilter.edu` and host `runaway.netfilter.edu` exist on the
same subnet. the runaway node , runs away:) to another subnet and
_changes_ its ip address [and hence dns name] to another address
probably assigned via dhcp once it joined the new network.
* however runaway.netfilter.edu told home.netfilter.edu to proxy arp for
it and moreover `registered` with home.netfilter.edu its NEW ip address
once it got it [after entering the new subnet].
* in the mobile ip implementation, the home.netfilter.edu receives
packets for runaway.netfilter.edu because of proxy arp AND then tunnels
these packets using a virtual device driver
my question is :
instead of tunnelling can the home.netfilter.edu just have a dynamic DNAT
rule which changes the destination address of the packet to the registered
ip address it should sent to . is there a problem with this ?
do reply. thank you,
 how does one proxy arp ? i tried to arp -s <hostname> <iface> pub
and tried to ping from some other host outside the subnet and it failed.
i thought the who-has request at the local subnet router will be answered
by the host which does proxy arp but then what went wrong here ?