exploit the possibilities
Home Files News &[SERVICES_TAB]About Contact Add New

spoof5.txt

spoof5.txt
Posted Aug 17, 1999

No information is available for this file.

tags | spoof
SHA-256 | 04531e74d75090946e531a9a0349be01c7e3972329c0d222bb2163b9c82ed8e4

spoof5.txt

Change Mirror Download
IP spoofing on Cisco IOS 10.2

Hi Paul, I have several follow-up queries embedded below. Later, Ken H.
---------------------------------------------------------------------------
Kenneth M. Hays, Assistant Director hays@scri.fsu.edu
Supercomputer Computations Research Institute aka kmh8 at the NIC
Florida State University voice=904-644-7053
400 Dirac Science Center Library fax=904-644-0098
Tallahassee, Florida 32306-4052
----------------------------------------------------------------------------
--------------- Prompting Message Fragment Follows ---------------

Paul Ferguson wrote on 30-Apr-96 at 11:21:28 -0400, in part:
>Regardless of whether you're using 10.2 or 10.3, defeating IP spoofing
>is a pretty trivial thing to accomplish. All you need to do is configure
>an access list that explicitly denies packets destined for a specific
>(sub)network which claim to have originated from the same (sub)network.
>
>There are basically two ways to do this; on the inbound path and on the
>outbound path.
>
>
> | +--+
> | b| +--<---
> +--+ |a
> | | |
> | +--+
> |
> ethernet 192.1.1.0
>
>
>[inbound]
>
>interface Ethernet0
>ip address 192.1.1.0 255.255.255.0
>
>interface Serial0
>ip address 192.1.2.0 255.255.255.0
>ip access-group 1 in

I thought the access-group should reference the access list. As in
ip access-group 100 in
^^
Comment ?

>
>access-list 100 deny 192.1.1.0 0.0.0.255 192.1.1.0 0.0.0.255

I expected a "deny" of traffic with any destination address claiming
to be sourced from the "IP subnet assigned to the ethernet" as in -
access-list 100 deny 192.1.1.0 0.0.0.255 0.0.0.0 255.255.255.255
match any destination address ^^^^^^^^^^^^^^^^^^^^^^^
Comment ?

>access-list 100 permit 0.0.0.0 255.255.255.255 192.1.1.0 0.0.0.255
>
>[outbound]
>
>interface Ethernet0
>ip address 192.1.1.0 255.255.255.0
>ip access-group 1 out

I thought the access-group should reference the access list. As in
ip access-group 100 in
^^
Comment ?

>
>interface Serial0
>ip address 192.1.2.0 255.255.255.0
>
>access-list 100 deny 192.1.1.0 0.0.0.255 192.1.1.0 0.0.0.255

I expected a "deny" of traffic with any source address claiming
to be destined for the "IP subnet assigned to the ethernet" as in -
access-list 100 deny 0.0.0.0 255.255.255.255 192.1.1.0 0.0.0.255
match any source addr ^^^^^^^^^^^^^^^^^^^^^^^
Comment ?

>access-list 100 permit 0.0.0.0 255.255.255.255 192.1.1.0 0.0.0.255
>
>[snip]
>
>- paul
..omitted text
Login or Register to add favorites

File Archive:

March 2024

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Mar 1st
    16 Files
  • 2
    Mar 2nd
    0 Files
  • 3
    Mar 3rd
    0 Files
  • 4
    Mar 4th
    32 Files
  • 5
    Mar 5th
    28 Files
  • 6
    Mar 6th
    42 Files
  • 7
    Mar 7th
    17 Files
  • 8
    Mar 8th
    13 Files
  • 9
    Mar 9th
    0 Files
  • 10
    Mar 10th
    0 Files
  • 11
    Mar 11th
    15 Files
  • 12
    Mar 12th
    19 Files
  • 13
    Mar 13th
    21 Files
  • 14
    Mar 14th
    38 Files
  • 15
    Mar 15th
    15 Files
  • 16
    Mar 16th
    0 Files
  • 17
    Mar 17th
    0 Files
  • 18
    Mar 18th
    10 Files
  • 19
    Mar 19th
    32 Files
  • 20
    Mar 20th
    46 Files
  • 21
    Mar 21st
    16 Files
  • 22
    Mar 22nd
    13 Files
  • 23
    Mar 23rd
    0 Files
  • 24
    Mar 24th
    0 Files
  • 25
    Mar 25th
    12 Files
  • 26
    Mar 26th
    31 Files
  • 27
    Mar 27th
    19 Files
  • 28
    Mar 28th
    42 Files
  • 29
    Mar 29th
    0 Files
  • 30
    Mar 30th
    0 Files
  • 31
    Mar 31st
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2022 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close