Any knowledge for sysctl? Post: 13069

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Special Forums IP Networking Any knowledge for sysctl? Post 13069 by developer on Thursday 10th of January 2002 06:02:43 PM

01-10-2002

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What I am trying to do is to develop a micromobility protocol, i.e. a protocol that will allow users to move from one place to another while containing all the already active connections. From the TCP/IP protocol stuck point of view the protocol I am developing lyies on top of IP so I couldn't use either TCP sockets or UDP sockets only RAW sockets. RAW sockets is not a problem from the communication point of view, I already have accomplished a big part of the protocol. The problem is that a damn message requires the source IP field of the IP packet to be set to zero. Now if you try to set the address to zero (INADDR_ANY) the kernel will set the source IP address to the IP address of the outgoing interface, that applies even if you set the IP_HDRINCL socket option and try to build the IP header from scrutch. In order to prevent the kernel from changing the source IP address I tryed to set the proc.sys.net.ipv4.ip_nonlocal_bind flag as I described but still this doesn't seam to work.
To conclude I am quite sure that the code is OK and the problem is defenitelly some kernel configurations because I saw an implementation of the DHCP, which also requires the source IP address of the first message to be set to zero, and the code was the same as mine.

Last edited by developer; 01-10-2002 at 07:08 PM..

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trpt

trpt(8c) trpt(8c)

Name
trpt - transliterate protocol trace

Syntax
trpt [ -a ] [ -s ] [ -t ] [ -j ] [ -p hex-address ] [ system [ core ] ]

Description
The command interrogates the buffer of TCP trace records created when a socket is marked for debugging and prints a readable description of
these records.

Options
When no options are supplied, prints all the trace records found in the system grouped according to TCP connection protocol control block
(PCB). The following options may be used to alter this behavior:

-s In addition to the normal output, prints a detailed description of the packet sequencing information.

-t In addition to the normal output, prints the values for all timers at each point in the trace.

-j Gives a list of the protocol control block addresses for which there are trace records.

-p Shows only trace records associated with the protocol control block whose address follows.

-a In addition to the normal output, prints the values of the source and destination addresses for each packet recorded.

The recommended use of is to isolate the problem and enable debugging on the socket(s) involved in the connection. Find the address of the
protocol control blocks associated with the sockets using the -A option to Then run with the -p option, supplying the associated protocol
control block addresses. If there are many sockets using the debugging option, the -j option may be useful in checking to see if any trace
records are present for the socket in question.

If debugging is being performed on a system or core file other than the default, the last two arguments may be used to supplant the
defaults.

Diagnostics
no namelist
The system image does not contain the proper symbols to find the trace buffer.

Other diagnostic messages are self-explanatory.

Files
See Also
netstat(1), setsockopt(2)

trpt(8c)