The following commit breaks cisco mode with my WAN drivers:
author David S. Miller <davem@davemloft.net>
Tue, 28 Jun 2005 22:25:31 +0000 (15:25 -0700)
commit 689be43945e9ca7dd704522e55af1b8a73a994d3
"[NET]: Remove gratuitous use of skb->tail in network drivers."
The following patch fixes it - please apply (cisco_hard_header does
skb_push(4 bytes)).
Signed-off-by: David S. Miller <davem@davemloft.net>