Network sniffing script

[kimquirk]

Add a network sniffing script to ship.2 to allow us to better debug networking problems. We also need to add tcpdump to the build.

[jcardona]

A simple bash script was given here: http://dev.laptop.org/ticket/4805#comment:22

[cscott]

It was added to the ship.2 build Wed Nov 28 01:22:43 2007 -0500; it should be moved to olpc-utils for update.1. I haven't actually tested the script yet to confirm that it works.

[bernie]

Looks like a good task for an intern. Could we assign this to Yiannis?

Also, adding tcpdump is easly done with "yum install tcpdump". Please, let's not add even more developer tools to the builds.

[cscott]

Bernie, could you add olpc-network-capture from:

http://dev.laptop.org/git?p=users/cscott/pilgrim;a=blob;f=streams.d/olpc-development.stream;hb=ship.2#l499

to olpc-utils for update.1? Network-diagnostic scripts are an exception to the rule 'you can download it later' -- because if you could, you probably wouldn't need to network diagnostic tool.

[cscott]

Bernie, you'll also need to add tcpdump as a dependency of olpc-utils at the same time, since it's not in the joyride/update.1 package list.

[bernie]

Done in olpc-utils-0.59-1.olpc2, building in Koji right now.

[bernie]

Oh, I mean. Ok for Update.1?

[dgilmore]

please test build 666

[bernie]

Problems:

• olpc-netstatus requires ethtool. Can we do without? Do we need to add a dependency in olpc-utils?

• olpc-netlog does not like the sudo environment where sbin is not in the path

Proposal: let's add /usr/sbin and /sbin to the path of all users. Is there anyone who actually *likes* the bin vs sbin distintion?

[dwmw2]

It's

echo $TRAFFIC_MASK > /sys/class/net/eth0/lbs_rtap

(note: eth0 not msh0, not in the device/ subdir, and 'lbs' not 'libertas') and you can't do it while the eth0 or msh0 devices are running, so bring them down first.

[carrano]

This change breaks olpc-netcapture. Who keeps this? Yani?

I updated some wiki pages on sniffing.

Even with this corrections, msh0_rename (#5746) will render some wiki pages wrong and some scripts broken.

[carrano]

Proposal: let's add /usr/sbin and /sbin to the path of all users. Is there anyone who actually *likes* the bin vs sbin distintion?

I think the correct approach would be put the command paths inside the scripts. Instead of

ifconfig eth0 ...

use:

/sbin/ifconfig eth0 ...

or:

ifconfig="/sbin/ifconfig"

...

$ifconfig eth0 ...

[jg]

Yani, without an updated script, this is going nowhere for update.1...

[yani]

I dont think this is related to msh0/msh0_rename (5746)

When applying david's patch

ifconfig eth0 down
echo $TRAFFIC_MASK > /sys/class/net/eth0/lbs_rtap

everything works fine.

But, still ifconfig eth0 down, sometimes takes forever to complete.

Ricardo can you give some hints here? so we can finally update the script

[dwmw2]

Dunno why ifconfig down would take time -- it does nothing with the hardware directly, and just stops the network TX queue. Please show SysRq-T and/or SysRq-P output while you're waiting for it.

[carrano]

Replying to yani:

I dont think this is related to msh0/msh0_rename (5746) When applying david's patch {{{ ifconfig eth0 down echo $TRAFFIC_MASK > /sys/class/net/eth0/lbs_rtap }}} everything works fine.

Yani, that's what I meant. The script was broken because of the changing in activating rtap0. An easy fix.

Other scripts, though, use hardcoded 'msh0' (which I think it's ok) and they were broken until the udev fix.

[bernie]

Fixed in olpc-utils-0.66.

[bernie]

Please use olpc-utils-0.67-1 instead.

[jg]

approved...

[dgilmore]

Please test build 690