[TriLUG] Linux Host connectivity issue

[Ron Kelley via TriLUG]

Sounds like the wireless card is trying to get a DHCP address - thus using the interface as the default GW.  When the connection fails, it goes back to the onboard ethernet interface.

Any way to remove the wireless device?




On 02/28/2018 01:04 PM, Matt Flyer via TriLUG wrote:
> I am experiencing a strange network issue and I am not sure how to go
> about diagnosing the cause.  I have a Linux box running Ubuntu 16.04.
>   It is in a vlan with with a gateway IP address.  The network is wired
> and the wireless interfaces are disconnected.  The ethernet line comes
> into a local switch on my desk and from there to the PC.
> 
> Intermittently I am losing (Internet) connectivity and when this
> happens I can't ping the gateway but I can, at least almost always,
> successfully ping other hosts in the vlan. I tried removing this
> switch and plugging directly into the wall jack.  No difference.
> 
> My initial thought was that there is a problem with the main switch or
> router, which I don't have access to, but here is where it gets
> interesting.  Nobody else is experiencing trouble, nor am I seeing the
> problem if I boot the PC up in Windows instead of Linux.  Also, while I
> am unable to ping the gateway with this machine, I can ping it with
> another (windows) machine plugged into the same local switch on my
> desk.
> 
> In other words, it appears to be an issue with the software (?) on this
> PC, but I don't know what or why.
> 
> Any suggestions?
> 
>