Hot Downloads

Welcome, Guest
Username: Password: Remember me
  • Page:
  • 1
  • 2

TOPIC: Wildcard mask practice

Wildcard mask practice 7 years 6 months ago #29455

  • msarro
  • msarro's Avatar
  • Offline
  • New Member
  • Posts: 6
  • Karma: 0
Just curious if anyone knows of any printable worksheets for wildcard masking? I know that there are a ton out there on the internets for subnetting, but sadly I don't have an issue with subnetting, lol.
The administrator has disabled public write access.

Re: Wildcard mask practice 7 years 6 months ago #29456

  • Smurf
  • Smurf's Avatar
  • Offline
  • Moderator
  • Posts: 1390
  • Karma: 1
Not sure what you are asking ? Is it given a subnet, whats the wildcard mask ?

Subnet 255.255.252.0
Inverse Mask 0.0.3.255

If so, then you just subtract 255 from each octect in the mask.

e.g.

255 - 255 = 0
255 - 255 = 0
255 - 252 = 3
255 - 0 = 255

Cheers
Wayne Murphy
Firewall.cx Team Member
www.firewall.cx

Now working for a Security Company called Sec-1 Ltd in the UK, for any
Penetration Testing work visit www.sec-1.com or PM me for details.
The administrator has disabled public write access.

Re: Wildcard mask practice 7 years 6 months ago #29457

  • msarro
  • msarro's Avatar
  • Offline
  • New Member
  • Posts: 6
  • Karma: 0
I'm looking for like, pdf worksheets for advanced wildcard masks :)

things like...
0.0.0.5, etc
The administrator has disabled public write access.

Re: Wildcard mask practice 7 years 6 months ago #29464

  • Smurf
  • Smurf's Avatar
  • Offline
  • Moderator
  • Posts: 1390
  • Karma: 1
Dont know of anything. The basic principle is the same though (the maths). "255 - the inverse masks gets you to the proper subnet".

In your case, 0.0.0.5

255 - 0 = 255
255 - 0 = 255
255 - 0 = 255
255 - 5 = 250

255.255.255.250 (not a valid subnet) but 0.0.0.7

255 - 0 = 255
255 - 0 = 255
255 - 0 = 255
255 - 7 = 248

255.255.255.248 is a valid subnet.

Cheers

Wayne
Wayne Murphy
Firewall.cx Team Member
www.firewall.cx

Now working for a Security Company called Sec-1 Ltd in the UK, for any
Penetration Testing work visit www.sec-1.com or PM me for details.
The administrator has disabled public write access.

Re: Wildcard mask practice 7 years 6 months ago #29467

  • S0lo
  • S0lo's Avatar
  • Offline
  • Moderator
  • Posts: 1577
  • Thank you received: 7
  • Karma: 3
Wildcards topics are usually bound to "Access Lists" and "OSPF areas" topics. So you better search for keywords relating to that to find some thing useful. For a starter these might help:

www.cisco.com/warp/public/707/confaccesslists.pdf
www.routeralley.com/ra/docs/access_lists.pdf

There is also an online preview book on ACLs
books.google.com/books?id=P3aE0pgSFfcC&a..._summary_r&cad=0

I know you didn't ask for ACLs but thats just the way it is, Wildcards are usually described within.
Studying CCNP...

Ammar Muqaddas
Forum Moderator
www.firewall.cx
The administrator has disabled public write access.

Re: Wildcard mask practice 7 years 6 months ago #29470

  • skepticals
  • skepticals's Avatar
  • Offline
  • Expert Member
  • Posts: 783
  • Karma: 0
The administrator has disabled public write access.
  • Page:
  • 1
  • 2
Time to create page: 0.084 seconds

CCENT/CCNA

Cisco Routers

  • SSL WebVPN
  • Securing Routers
  • Policy Based Routing
  • Router on-a-Stick

VPN Security

  • Understand DMVPN
  • GRE/IPSec Configuration
  • Site-to-Site IPSec VPN
  • IPSec Modes

Cisco Help

  • VPN Client Windows 8
  • VPN Client Windows 7
  • CCP Display Problem
  • Cisco Support App.

Windows 2012

  • New Features
  • Licensing
  • Hyper-V / VDI
  • Install Hyper-V

Linux

  • File Permissions
  • Webmin
  • Groups - Users
  • Samba Setup