Enable netem in my Linux box
Subsystems (2)
Hi:
My Linux box has CentOS5 installed. But I could not run tc command with any netem parameters in command line. as shown in web site
http://linux-net.osdl.org/index.php/Netem. I suspect, Netem was either not part of the installed OS or has not been enabled. Can you tell how to verified? When I type in "rpm -qa" I see only iproute-2.6.18-4.el5, do I need iproute2? Can you tell me how to update my Linux kernel to include netem functionality. Thanks,
Koon-Wah.
Quoted 10 lines · On Wed, 09 May 2007 11:31:17 -0400 Koon Wah Yick <[email protected]>…
Hi:
My Linux box has CentOS5 installed. But I could not run tc command with any netem parameters in command line. as shown in web site
http://linux-net.osdl.org/index.php/Netem. I suspect, Netem was either not part of the installed OS or has not been enabled. Can you tell how to verified? When I type in "rpm -qa" I see only iproute-2.6.18-4.el5, do I need iproute2? Can you tell me how to update my Linux kernel to include netem functionality. Thanks,
Quoted 7 lines
Koon-Wah.
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modinfo sch_netem
Signature · 1 line
Stephen Hemminger <[email protected]>
Stephen:
Thank you for your response, I type in modinfo sch_netem
Here is what I got:
filename: /lib/modules/2.6.11-1.1369_FC4/kernel/net/sched/sch_netem.ko
license: GPL
vermagic: 2.6.11-1.l369_FC 686 REGPARM 4KSTACKS gcc-4.0 depends:
srcversion: BD4563861423428FF0D5918
when I try the following "tc" command with netem
Quoted 1 line
tc qdisc change dev eth0 root netem loss 0.1%
I got the error message
RTNETLINK answers: No such file or directory.
I downloaded the ipRoute2 packet, build and re-install. Nothing change, same problem. I do "make xconfig" on my current kernel, see component netem is not enable. I enable it and re-build the kernel that does not work for me as well, the new kenerl does not boot (there may be other problem in building it). Is there an easier way to enable NETEM?
Koon-Wah.
Quoted 25 lines · Stephen Hemminger
Quoted 10 lines · On Wed, 09 May 2007 11:31:17 -0400 Koon Wah Yick <[email protected]>…
Hi:
My Linux box has CentOS5 installed. But I could not run tc command with any netem parameters in command line. as shown in web site
http://linux-net.osdl.org/index.php/Netem. I suspect, Netem was either not part of the installed OS or has not been enabled. Can you tell how to verified? When I type in "rpm -qa" I see only iproute-2.6.18-4.el5, do I need iproute2? Can you tell me how to update my Linux kernel to include netem functionality. Thanks,Quoted 7 lines
Koon-Wah.
-
To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.htmlmodinfo
sch_netem
Quoted 12 lines · On Thu, 10 May 2007 12:09:46 -0400 Koon Wah Yick <[email protected]>…
Stephen:
Thank you for your response, I type in modinfo
sch_netemHere is what I got:
filename:
/lib/modules/2.6.11-1.1369_FC4/kernel/net/sched/sch_netem.ko
license: GPL
vermagic: 2.6.11-1.l369_FC 686 REGPARM 4KSTACKS gcc-4.0 depends:
srcversion: BD4563861423428FF0D5918
Quoted 7 lines
when I try the following "tc" command with netem
Quoted 1 line
tc qdisc change dev eth0 root netem loss 0.1%
I got the error message
RTNETLINK answers: No such file or directory.
You want to use 'add' not 'change'.
The examples on the linux-net page are sequential, so the first one uses 'add'. Later examples, then use change to alter parameters
Stephen:
Thank you, I got it. I try the same command again with "add" and "change" they all work.(no error) But when I start my Network Emulator, how can I stop it. Do I have to delete any file I create when doing "add"? If yes, where is it?
Koon-Wah.
Quoted 29 lines · Stephen Hemminger
Quoted 12 lines · On Thu, 10 May 2007 12:09:46 -0400 Koon Wah Yick <[email protected]>…
Stephen:
Thank you for your response, I type in modinfo
sch_netemHere is what I got:
filename:
/lib/modules/2.6.11-1.1369_FC4/kernel/net/sched/sch_netem.ko
license: GPL
vermagic: 2.6.11-1.l369_FC 686 REGPARM 4KSTACKS gcc-4.0 depends:
srcversion: BD4563861423428FF0D5918Quoted 8 lines
when I try the following "tc" command with netem
Quoted 1 line
tc qdisc change dev eth0 root netem loss 0.1%
I got the error message
RTNETLINK answers: No such file or directory.You want to use 'add' not 'change'.
The examples on the linux-net page are sequential, so the first one uses 'add'. Later examples, then use change to alter parameters
Quoted 5 lines · On Thu, 10 May 2007 14:00:40 -0400 Koon Wah Yick <[email protected]>…
Stephen:
Thank you, I got it. I try the same command again with "add" and "change" they all work.(no error) But when I start my Network Emulator, how can I stop it. Do I have to delete any file I create when doing "add"? If yes, where is it?
You probably just want to do:
tc qdisc del dev eth0 root
That restores the default qdisc (prio-fast)
Signature · 1 line
Stephen Hemminger <[email protected]>
Stephen:
Thank you. I am happy that when I issue the tc command to drop packets, I do see the effect. Is there a command I can use to show all packet count? packet send, packet received and packet drop etc... I don't seems to be able to see them by command "ifconfig".
Koon-Wah.
Quoted 16 lines · Stephen Hemminger
Quoted 5 lines · On Thu, 10 May 2007 14:00:40 -0400 Koon Wah Yick <[email protected]>…
Stephen:
Thank you, I got it. I try the same command again with "add" and "change" they all work.(no error) But when I start my Network Emulator, how can I stop it. Do I have to delete any file I create when doing "add"? If yes, where is it?
You probably just want to do:
tc qdisc del dev eth0 rootThat restores the default qdisc (prio-fast)