[Bridge] bridge-utils and ppp

Stephen Hemminger shemminger at vyatta.com
Fri Aug 22 16:50:10 PDT 2008

On Thu, 21 Aug 2008 17:44:59 -0700
"Kelvin Chan" <kelvinc at positronics.com> wrote:

> Hi Stephen,
> --god, I hate outlook. Sorry, was trying to insert an line break
> but instead sent the email. --
> I'm trying to create an multicast enabled Ethernet bridge using ppp
> and brctl. 
> I tried:
> brctl addbr br0
> brctl addif eth0
> brctl addif ppp0
> after last command, I get:
> can't add ppp0 to bridge br0: Invalid argument
> both eth0 and ppp0 are up and have an address. I googled around 
> and found this an issue with the kernel bridge code. However, in 
> Linux Foundation's bridge-utils documentation, it didn't mention
> the required kernel version. I'm running 2.6.18 from Debian Etch.
> Can you give me any hints to bridge an ppp to eth device?

Won't work because PPP is a tunneling interface so it doesn't
have an ethernet header required for bridging.  Layer 2 versus Layer 3 issue.

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