Spoofing, defense?

[Guilmot Mike]

Alex Zivenko wrote:
> Everybody know what is spoofing.
> How can I protect my server from it? It's a router to the internet,
> but some of my friends spoof the address and go thrue the router.
> Firewall can't protect.  
> Any suggestions?

Follow an ipf howto/tutorial.
There are MANY of them around.

In my firewall I prevent it like:

# Anti-spoof, no loggin [ I hate reading them ;-) ]

block in quick on rl0 from 192.168.0.0/16 to any #RFC 1918 private IP

block in quick on rl0 from 172.16.0.0/12 to any #RFC 1918 private IP

block in quick on rl0 from 10.0.0.0/8 to any #RFC 1918 private IP

block in quick on rl0 from 127.0.0.0/8 to any #loopback

block in quick on rl0 from 0.0.0.0/8 to any #loopback

block in quick on rl0 from 169.254.0.0/16 to any #DHCP auto-config

block in quick on rl0 from 192.0.2.0/24 to any #reserved for doc's

block in quick on rl0 from 204.152.64.0/23 to any #Sun cluster interconnect

block in quick on rl0 from 224.0.0.0/3 to any #Class D & E multicast



Hope this was what you meant ...


Kind regards,

Guilmot Mike