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become
2003 May 02
0
masquerading with dhcp
...problem --
a user has dialup connectivity to isp via pppd on-demand.
tcp syn request to an ip address
.or.
dns lookup for a host name (bind cfg forwards to isp dns)
.and.
default route is ppp0
.so.
udp dns request to isp dns ip address
.or.
tcp syn packet to ip address
the issue becsome the source ip address for these packets -- they are
sent by the last ip address that the ppp interface had. of course, once
the connection is established, then ip address has changed, so all those
neat little packets have an invalid source ip address.
so, the end goal is to keep retrying the tcp...