netdev - Re: [PATCH] Net-ethtool : Allow ethtool to set interface in loopback mode.

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Date:	Tue, 30 Nov 2010 18:48:36 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	Mahesh Bandewar <maheshb@...gle.com>
Cc:	David Miller <davem@...emloft.net>,
	linux-netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] Net-ethtool : Allow ethtool to set interface in
 loopback mode.

On Tue, Nov 30, 2010 at 12:00:29AM -0800, Mahesh Bandewar wrote:
> This patch enables ethtool to set the loopback mode on a given
> interface. This is the reworked version of earlier submit (which I
> don't have reference to). By configuring the interface in loopback
> mode in conjunction with a policy route / rule, a userland application
> can stress the egress / ingress path exposing the flows of the change
> in progress and potentially help developer(s) understand the impact of
> those changes without even sending a packet out on the network.
> 
> Following set of commands illustrates one such example -
>     a) ifconfig eth1 192.168.1.1

         Given that b) and c) use ip it seems to me that it would
	 make sense to use i for a) too. 

	 ip addr add 192.168.1.1/24 dev eth1

>     b) ip -4 rule add from all iif eth1 lookup 250
>     c) ip -4 route add local 0/0 dev lo proto kernel scope host table 250
>     d) arp -Ds 192.168.1.100 eth1
>     e) arp -Ds 192.168.1.200 eth1
>     f) sysctl -w net.ipv4.ip_nonlocal_bind=1
>     g) sysctl -w net.ipv4.conf.all.accept_local=1
>     # Assuming that the machine has 8 cores
>     h) taskset 000f netserver -L 192.168.1.200
>     i) taskset 00f0 netperf -t TCP_CRR -L 192.168.1.100 -H 192.168.1.200 -l 30
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