[uml-devel] Re: What to do with uml_switch?

["Steve Schmidtke" <steve_schmidtke@hotmail.com>]

Michael Richardson wrote:
>  uml_netjig is a tool which does the following:
>   1) moves packets using "daemon" mode a la uml_switch.
>  2) has an expect-friendly command line interface  3) can create 
>*multiple* switches and keep them seperate

If they are separate, why not just run multiple uml_switches?

>  4) can record all packets to a .pcap file
>  5) can play packets from a .pcap file at a given rate     (or under 
>command line interface control)
>  6) can optionally answer ARP queries for imaginary nodes.

I like these 3, but could you not just connect another UML guest to the 
switch and run arp -s pub and tcpdump to accomplish the same thing?

>  7) can talk to tuntap device(s) as uml_switch could.
>
>  My patches refactor uml_switch to get uml_netjig + uml_switch'

I am still not clear if uml_netjig is a separate program running on top of 
uml_switch or inside it, but (and I apologize for being dense if this is 
what you are doing) I think the proper way to accomplish what you want is to 
create a "-monitor <socket>" option to uml switch to filter all network 
traffic through.  Then create a monitor program that can attach/detach from 
a uml_switch at will through the monitor socket.  A hook to filter packets 
entering uml_switch and a new function to inject packets (with/without 
updating MAC tables) might be all that's necessary.  All your traffic 
management and expect code could reside in the external monitor program.

Steve schmidtke




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