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NetworkManager creates a slew of DHCP requests with Mininet 2.0, 2.1, and 2.2 #228

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mrhegde opened this issue Oct 15, 2013 · 7 comments

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@mrhegde
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commented Oct 15, 2013

We observe about 3 lakh packets per second for an average 5 interfaces switch, 100 switch topology on mininet 2.1.0. When the same scripts are run using mininet 2.0.0 these packets are not observed. Doing a ls on /var/lib/NetworkManager on an ubuntu system while 2.1.0 is running displays .lease files aplenty. These files are never observed on mininet 2.0.0. If this is a bug please provide us workarounds. More, the CPU where the mininet (alone) is running shoots up over 93% in less than a minute.

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@lantz

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commented Oct 15, 2013

That's surprising, and something I've never seen.

  1. Are you sure it doesn't happen with Mininet 2.0.0 on the same OS?

  2. Does it happen if you turn off NetworkManager?

@azadi

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commented Mar 17, 2014

I had the same issue with 13.10. Disabling the NetworkManager fixes this issue. I tried to find out what is causing this but without much luck.

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commented Apr 21, 2014

Temporary workaround: sudo stop network-manager

@bocon13 bocon13 added the bug label May 30, 2014

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commented Jun 3, 2014

Probably we want to either turn off network-manager or hide the interfaces from it (e.g. by putting them in their own namespace.)

@lantz lantz added the B label Jun 3, 2014

@bocon13 bocon13 added this to the Mininet 2.2.0 milestone Jun 11, 2014

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commented Sep 24, 2014

I am seeing this now on 14.10 also.

@lantz lantz changed the title Mininet 2.1.0 creates a slew of dhcp client requests NetworkManager creates a slew of DHCP requests with Mininet 2.0, 2.1, and 2.2 Nov 21, 2014

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commented Nov 21, 2014

Added to 2.2.0 release notes and moved to C priority.

@lantz lantz added C and removed B labels Nov 21, 2014

@ewall

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commented Sep 20, 2015

Can anyone suggest a nice work-around to disable Network Manager on all the Mininet-generated interfaces for those who don't want to disable it completely?

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