Information on forwarding queue occupation in a Linux router Post: 303039947

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Special Forums UNIX and Linux Applications Information on forwarding queue occupation in a Linux router Post 303039947 by i_mll on Friday 18th of October 2019 12:29:31 PM

10-18-2019

Registered User

Information on forwarding queue occupation in a Linux router

Hello.
I have an OpenWrt router forwarding traffic from a network to another and I'm building a monitoring tool that requires information about the packet queue/ ring buffer (in the receiving side/interface - rx) occupation, alerting me when it is close to its maximum capacity.

However, after analysing the following files (linux filesystem):

tcp_mem/tcp_rmem/tcp_wmem in /proc/sys/net/ipv4
tx_queue_len in /sys/class/net/(interface)
sockstat in /proc/net

I concluded these files would only be relevant for my program if the router was the destination or source of the TCP packets, which is not the case. So, as I discussed with a professor of mine, the metrics these files provide are not relevant in a forwarding situation, as the packets do not go to the TCP queues.

If that's true, then where (in what folder/file) can I find information about the router's forwarding queue's current occupation and its maximum occupation, if there's any information on the matter? Note that this question is not limited to the OpenWrt OS, but any linux system.

i_mll

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LEARN ABOUT DEBIAN

exiqsumm

EXIQSUMM(8)						      System Manager's Manual						       EXIQSUMM(8)

NAME

       exiqsumm - Summarising the queue

SYNOPSIS

       exiqsumm [-a] [-c]

DESCRIPTION

       The  exiqsumm  utility  is a Perl script which reads the output of exim -bp and produces a summary of the messages on the queue.  Thus, you
       use it by running a command such as

	 exim -bp | exiqsumm

       The output consists of one line for each domain that has messages waiting for it, as in the following example:

	   3   2322   74m   66m  msn.com.example

       This lists the number of messages for the domain, their total volume, and the length of time that the oldest and the newest  messages  have
       been  waiting.	By  default  the output is sorted on the domain name, but exiqsumm has the options -a and -c, which cause the output to be
       sorted by oldest message and by count of messages, respectively.

       The output of exim -bp contains the original addresses in the message, so this also applies to the output from exiqsumm.  No  domains  from
       addresses  generated  by  aliasing or forwarding are included (unless the "one_time" option of the redirect router has been used to convert
       them into 'top level' addresses).

BUGS

       This manual page needs a major re-work. If somebody knows better groff than us and has more experience in writing manual pages, any patches
       would be greatly appreciated.

SEE ALSO

       exim(8), /usr/share/doc/exim4-base/

AUTHOR

       This  manual  page was stitched together from spec.txt by Andreas Metzler <ametzler at downhill.at.eu.org>, for the Debian GNU/Linux system
       (but may be used by others).

								  March 26, 2003						       EXIQSUMM(8)