Penetration Testing mailing list archives
Re: Layer 2 Trace
From: "Gary E. Miller" <gem () rellim com>
Date: Sat, 3 Dec 2005 11:44:45 -0800 (PST)
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Yo James! On Fri, 2 Dec 2005, James Eaton-Lee wrote:
Layer two only provides connectivity to machines attached to the same segment.
You have to be very carefull on what denotes a segment. What with bridges and tunnels that segment could have a crazy topology. I have ethernet segments that span 2 states using bridge style tunneling.
In the case of ethernet, this means the local network segment, such as a 192.168.0.1/24 class C subnet of 255 hosts - in order to communicate with hosts on a wide area/extended/inter network (ie. across more than one local network), traffic needs to be routed (which occurs at layer three).
You are confusing layer 2 and layer 3. There are no IPs on layer 2! I often put several layer 3 IP subnets on one physical layer 2 net. You can do this with or without using VLAN tagging. RGDS GARY - --------------------------------------------------------------------------- Gary E. Miller Rellim 20340 Empire Blvd, Suite E-3, Bend, OR 97701 gem () rellim com Tel:+1(541)382-8588 Fax: +1(541)382-8676 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (GNU/Linux) iD8DBQFDkfWw8KZibdeR3qURAm4nAJwPG88aficwJ3du7Di8UHlGBrB+rACg1qIG D18qAo8Humhy1m4MlOk6eUI= =6wNE -----END PGP SIGNATURE----- ------------------------------------------------------------------------------ Audit your website security with Acunetix Web Vulnerability Scanner: Hackers are concentrating their efforts on attacking applications on your website. Up to 75% of cyber attacks are launched on shopping carts, forms, login pages, dynamic content etc. Firewalls, SSL and locked-down servers are futile against web application hacking. Check your website for vulnerabilities to SQL injection, Cross site scripting and other web attacks before hackers do! Download Trial at: http://www.securityfocus.com/sponsor/pen-test_050831 -------------------------------------------------------------------------------
Current thread:
- Layer 2 Trace riftman (Dec 02)
- Re: Layer 2 Trace James Eaton-Lee (Dec 03)
- Re: Layer 2 Trace Gary E. Miller (Dec 04)
- Re: Layer 2 Trace James Eaton-Lee (Dec 04)
- Re: Layer 2 Trace Gary E. Miller (Dec 04)
- Re: Layer 2 Trace Carles Fragoso i Mariscal (Dec 03)
- Re: Layer 2 Trace Francois Labreque (Dec 03)
- Re: Layer 2 Trace James (Dec 05)
- R: Layer 2 Trace Massimo Baschieri (Dec 06)
- Re: R: Layer 2 Trace James (Dec 27)
- Re: R: Layer 2 Trace Maciek Dudek (Dec 28)
- R: Layer 2 Trace Massimo Baschieri (Dec 06)
- Re: Layer 2 Trace James Eaton-Lee (Dec 03)
- <Possible follow-ups>
- RE: Layer 2 Trace Dario Ciccarone (dciccaro) (Dec 03)
- Re: Layer 2 Trace riftman (Dec 03)
- Re: Layer 2 Trace Cedric Blancher (Dec 04)