Messages in this thread | | | From | Kevin K <> | Subject | Re: sending raw packets via PPP | Date | Sun, 19 Aug 2007 18:46:21 -0500 |
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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. > > -- > James Carlson 42.703N 71.076W > <carlsonj@workingcode.com>
I would like to thank the people who responded to this posting for their help. It helped keep me from wasting additional time trying to use SOCK_PACKET over PPP just because the DHCP code in Red Hat used it for ethernet. (The dhclient code did it to ensure that the ethernet/IP/UDP headers were to their satisfaction, and to avoid some bugs in older versions of the Linux kernel).
I've tested through a serial/PPP connection without issues.
This is obviously not a normal configuration, having to run a DHCP client through PPP, but the IP addresses are assigned via a DHCP server, but he router we connect to via PPP won't retrieve addresses from the DHCP server for us.
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