On 09/16/2010 01:39 PM, hong sheng wrote:
I mean "bring up the 3G connectivity automatically when we start web
brower application", not just http.
sounds pretty shortsighted, considering that the internet contains
many more things than http...
This is common for dialup. Routers that support "dial" on demand for
connections that cost $$$ typically have firewall like rules that
identify packets that should start the connection. Iptables can
certainly have a "call" chain to identify outgoing packets that should
trigger a dial. At least initially, the "call" chain would match just
tcp port 80. Iptables can also match on process name (that owns the
socket), and so could match firefox or squid.
So how to get something to happen when the call chain is matched?
Simple but inefficient: use a LOG target and watch /var/log/messages for
a magic string. Efficient, but more work: use a ULOG target to
multicast a notification packet to any userspace multicast listeners on
the designated channel.
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