On Aug 6, 2007, at 6:30 PM, James Carlson wrote:
Kevin K writes:
Is it possible to send raw packets via ppp under Linux?
More specifically, in 2.4 series kernels such as RH's 2.4.21-47
kernel?
I've trying to modify the DHCP 3.0.1 code provided with RH 3 so I can
send requests via a PPP connection (standard RS-232), and it is just
being dropped by the stack according to ifconfig and debug statements
in ppp_generic.c.
I'm not sure what sort of "raw" packets you're talking about (IP raw
or something else), but you shouldn't need to send any raw packets to
do this. DHCP runs over UDP, and, unlike Ethernet, there's no link
layer addressing to worry about.
I was basing the raw mode on comments in the DHCP source code about
problems in older Linux kernels with sending packets to
255.255.255.255 via normal IP. The DHCP source code therefore wants
to send raw packets (SOCKET_PACKET) (down to the ethernet addressing
info). I guess I thought I would need to do this too to fit in with
the existing source code.
I'll give it a try to see whether packets sent to 255.255.255.255 can
make it to ppp with the IP address unchanged.
Thanks,
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