David A. Ranch <[EMAIL PROTECTED]> wrote:
>
> But how do you setup your routing then? The cablemodem isn't a
> complete route and though the modem link would work, its slow.
Routing only determines where packets will be sent TO.
The ISP determines how they will be sent to you.
In essence, the ISP has to do the hard work of setting up the asymmetric
route. Your masq box will not ignore packets just because they come in
a different interface than they went out (unless you configure your
firewall rules to prevent it). The masq box doesn't really know which
interface is being used for which connections; it doesn't care. It just
receives packets, consults the route and masq tables, and sends them to
where they belong.
> So the IP packets coming over the Eth link will be ACKed on the PPP
> interface purely based on the default route entry?
Right. Because it's not the TCP/IP stack on the masq box that does the
ACK's, it's the firewalled machine that does all that. The masq box is
just passing packets back and forth. :)
Now, services running on the masq box might be able to tell the
difference as to which interface a packet arrives on, but I kinda doubt
that they will care much. Programs like tcpdump and iptraf might have
fits, but standard apps will probably work.
--
[EMAIL PROTECTED] (Fuzzy Fox) || "Nothing takes the taste out of peanut
sometimes known as David DeSimone || butter quite like unrequited love."
http://www.dallas.net/~fox/ || -- Charlie Brown
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