[praxio]

I am trying to figure out how I can use NETEM module in DD-WRT , e.g,

# tc qdisc change dev eth0 root netem delay 100ms 10ms

and...

# tc qdisc change dev eth0 root netem loss .1%

I have seen some people doing it on OPENWRT but no one seems to have done it on DD-WRT. Here are the things that I have tried already.

I tried using "ipkg install ip tc" but apparently NETEM module does no come with these packages..

I used the frimware modification kit to copy "q_netem.o" and "sch_netem.so" from a similar kernel into my image file. But when I run "insmod sch_netem" nothing happens...

I figured maybe the best way is to compile a custom image but I have not been successful in building DD-WRT v.24. The current-toolchain that I downloaded does not seem to work for me at all. I keep getting syntax errors and cannot compile.


Does anyone know how I can run NETEM or compile a custom image with NETEM (compatible with my WGR614v8)? I would really appreciate any help.

[oxygenx]

you should really use openwrt then.

[praxio]

[phuzi0n]

[praxio]

DONE IT.

Building the whole firmware did not work for me. I compiled the modules and modified the firmware using firmware modification toolkit. Here are the instructions:

- Compile DD-WRT. See instructions at (http://www.dd-wrt.com/phpBB2/viewtopic.php?t=28348 ).
- Under src/router run 'make menuconfig'. make sure you select the netem module in linux kernel configuration : networking options --> QOS and fair Queuing --> (M) Network Emulator

- run install script and compile DD-WRT.
- find your q_netem.so in src/router/iproute2/tc/
- find your sch_netem.o in src/linux/brcm/linux_v24_2/net/sched/

- Checkout firmware modification toolkit.

$ mkdir firmware_mod_kit
$ cd firmware_mod_kit
$ svn checkout http://firmware-mod-kit.googlecode.com/svn/trunk/ firmware-mod-kit-read-only
$ cd firmware-mod-kit-read-only/trunk

- Extract the firmware you are using (I used a generic mini build):

$ ./extract_firmware.sh dd-wrt.v24_mini_generic.bin dd-wrt.v24_mini_generic

- Go to the extracted firmware directory, under rootfs:

$ cd dd-wrt.v24_mini_generic/rootfs

- copy q_netem.so to usr/lib

$ cp ~/DD-WRT/src/router/iproute2/tc/q_netem.so usr/lib

- copy sch_netem.so to lib/modules/2.4.36

$ cp ~/DD-WRT/src/router/linux/linux/net/sch/sch_netem.o lib/modules/2.4.37

- build the modified firmware:

$ cd ../../
$ ./build_firmware.sh dd-wrt.v24_mini_generic_netem dd-wrt.v24_mini_generic

- Your custom image is now in dd-wrt.v24_mini_generic_netem , upgrade your router with the image, then telnet to the router and run :

$ insmod sch_netem
$ lsmod

- You should be abale to see sch_netem is installed. netem should be working now. Run these commands to check:

$ tc qdisc add dev eth0 root netem delay 10ms
$ tc qdisc add dev eth0 root netem loss 20%

[makaveli101]

could you please make a fw with netdem for me? i use dir-615d r15778 (the only stable build)