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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mrinfo

mrinfo(1M)																mrinfo(1M)

NAME

       mrinfo - Multicast Routing Configuration Information Tool

SYNOPSIS

       debuglevel] retries] timeout] [ multicast-router ]

DESCRIPTION

       requests  the configuration information from the multicast-ourter, and prints the information to the standard out.  multicast-router can be
       either an IP address or a system name.  sends out the ASK_NEIGHBORS igmp  message  to  the  specified  multicast-router,  when  the  router
       receives  the request, it sends back its configuration information. If the multicast-router is not specified, the request is sent the local
       router.

       The the configuration information for each interface is printed in the following format:

       If there are multiple neighbor routers on one interface, they will all be reported on the output.  The possible values for flag are:

       Neighbors are reached via tunnel.

       The tunnel uses IP source routing.

       The interface is down.

       The interface is administratively disabled for multicast routing.

       The local router is the querier of the subnet.

       Please see mrouted(1M) for and

       The command line options are:

       Sets the level for printing out the debug message. The default is 0,
		     only error and warning messages will be printed. Debug level three prints most the messages.

       Sets the retry times to pull the routing daemon for information. The
		     default is 3.

       Specifies the timeout value in seconds for waiting the reply. The default value
		     is 4.

EXAMPLE

       The following is an example of quering the multicasting configuration from the local routing daemon.

	      127.0.0.1 (localhost) [version 3.3]:
		15.13.106.144 -> 15.13.106.145 (hpntcbs.cup.hp.com) [10/1/querier]
		193.2.1.39 -> 0.0.0.0 (all-zeros-broadcast) [1/1/disabled]
		15.13.106.144 -> 15.255.176.33 (matmos.hpl.hp.com) [10/1/tunnel]
		15.13.106.144 -> 15.17.20.7 (hpspddc.vid.hp.com) [10/1/tunnel/down]

   Note
       must be run as root.

AUTHOR

       was developed by Van Jacobson.

SEE ALSO

       mrouted(1M), map-mbone(1M).

																	mrinfo(1M)