Networking theories

[intrusion () ENGINEER COM (Jesus Oquendo)]

While this is not a vuln-dev I figured I would post it 
since it is security related. Apologies for the spammage if 
this has been addressed before.

Theories:

If source quench packets were sent as a spoofed host, and 
sent  to a destination in which someone were trying to slow 
down traffic as a form of Denial of Service attack would it 
work? 

victim.org(spoofed) ---> ICMP(source-quench) ---> 
router.victim.org 
 
Someone wants to slow down victim.org so would sending 
sourch quenches to victim.org's router claiming to be 
victim.org stating slow down any traffic coming to 
victim.org slow it down? 
 
What about poisining ARP addresses on a network... If 
packets were sent to a network from an attacker who somehow 
gained MAC addresses, or would that network's router be 
able to filter out that type of traffic from coming in 
validly? If so then via the access list of protocol type? 

Or if the router was not properly configured to determine 
that these ARP's are valid would it add these new changes 
that the attacker is sending as valid routing information 
and update its routing table addresses and or perhaps 
damage any relevant information for that network? Spanning 
Tree Protocol's, OSPF information, etc... 
 
What about the possibilty of "route poisining" might seem 
outrageous but what if complete routing changes were 
remotely  forced via some sort of spoofed data such as ARP 
floods, Spanning Tree based bogus traffic coming onto the 
network... Wouldn't router cost's be jeapordized resulting 
in a total nightmare... Ever heard or seen about any 
type of DoS like this, or have any links they'd care to e-
mail me on this subject?