Bug 458184 - NetworkManager gets fooled by RNDIS with no override possible
NetworkManager gets fooled by RNDIS with no override possible
Product: Fedora
Classification: Fedora
Component: NetworkManager (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Dan Williams
Fedora Extras Quality Assurance
Depends On:
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Reported: 2008-08-06 17:38 EDT by H. Peter Anvin
Modified: 2009-07-14 12:55 EDT (History)
6 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Last Closed: 2009-07-14 12:55:10 EDT
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RHEL 7.3 requirements from Atomic Host:
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Attachments (Terms of Use)
patch to fix ifcfg-rh nm-system-settings plugin which was incorrectly applying the IPADDR as the value of GATEWAY (1.31 KB, patch)
2009-01-07 23:11 EST, Charles R. Anderson
no flags Details | Diff

  None (edit)
Description H. Peter Anvin 2008-08-06 17:38:51 EDT
Description of problem:

Windows Mobile based cell phones use an Ethernet-like protocol, RNDIS, over USB for synchronization and Internet sharing.  They also use USB for charging the cell phone.

When plugged in, they will answer DHCP on the 169.254/16 network (despite this being nonsense) and give a default route, even though that may not actually lead anywhere.

Unfortunately, NetworkManager will always switch to this bogus "Ethernet".  Selecting a wireless network will cause it to switch over to it, and then immediately switch back.

The routing table ends up looking something like:

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface   U     0      0        0 eth1   U     0      0        0 virbr0   U     0      0        0 wlan0         UG    0      0        0 eth1

There needs to be an (easy) way to disable this network, at least for the purpose of being the default gateway.

One presumably doesn't want it to be automatically disabled, in case this is used for using the cell phone as an Internet-sharing device for 3G or EDGE.

Version-Release number of selected component (if applicable):

How reproducible:
Every time

Steps to Reproduce:
1. While on a wireless network, plug in a Windows Mobile 6 smartphone.
2. Check the resulting routing table.
3. Try to re-enable the wireless network.
Actual results:

Expected results:

Additional info:
Comment 1 Charles R. Anderson 2008-11-13 17:14:29 EST
I've seen this.  It is a pretty braindead behavior on behalf of the mobile device, but I suppose we need to make a workaround for it.
Comment 2 Charles R. Anderson 2009-01-07 23:11:37 EST
Created attachment 328435 [details]
patch to fix ifcfg-rh nm-system-settings plugin which was incorrectly applying the IPADDR as the value of GATEWAY

I just tried this with a WM6.1-based phone, and I don't get a gateway from the RNDIS device.  Do you still see this problem?

I'm using NetworkManager-0.7.0-1.git20090102.fc10 plus a patch (attached) and this is what I see with nm-tool:

- Device: eth2 ----------------------------------------------------------------
  Type:              Wired
  Driver:            rndis_host
  State:             connected
  Default:           no
  HW Address:        80:00:60:0F:E8:00

    Supported:       yes
    Carrier Detect:  yes

  Wired Settings

  IPv4 Settings:
    Prefix:          24 (

Now, I just fixed a bug that duplicates a connection's IP Address as its gateway if there isn't a gateway, so perhaps that is what you were hitting.  See if the attached patch fixes the issue for you.
Comment 3 Robert Townley 2009-02-25 16:12:45 EST
First, i don't know much.  But on multiple occasions, the newsgroup knowledge of /sbin/route makes us forget about the much more powerful /sbin/ip command, otherwise known as policy routing.

Wouldn't it be better to use Policy Routing for this to enable multiple default gateways based on priority - this bogus gateway would have the least priority / used last.  Most people will not have routed or some form of dynamic routing bgp  turned on. 

PolicyRouting.org has a free online book.
Comment 4 Jessica Sterling 2009-03-08 16:36:26 EDT
This bug has been triaged.

Fedora Bugzappers volunteer triage team
Comment 5 Bug Zapper 2009-06-09 22:23:52 EDT
This message is a reminder that Fedora 9 is nearing its end of life.
Approximately 30 (thirty) days from now Fedora will stop maintaining
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Comment 6 Bug Zapper 2009-07-14 12:55:10 EDT
Fedora 9 changed to end-of-life (EOL) status on 2009-07-10. Fedora 9 is 
no longer maintained, which means that it will not receive any further 
security or bug fix updates. As a result we are closing this bug.

If you can reproduce this bug against a currently maintained version of 
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