Need some guidance on OSPF Stub area, inverse mask and loopback

ed) area 10 stub Am I understanding the concepts properly about the advertisement? Is my wildcard ok in my last network statement? This is how I figure the inverse mask: In short: 192.168. 0110 0100.1 (for readability only use third octet) . 0011 . (I mat

Re: Need some guidance on OSPF Stub area, inverse mask and loopback

network 192.168.100.1 0.0.63.255 area 10 (100+ allowed to be advertised) area 10 stub Am I understanding the concepts properly about the advertisement? Is my wildcard ok in my last network statement? This is how I figure the inverse mask: In short:

Inverse Mask

I need help in understanding inverse masks that are used in network access list commands. I understabd what 0 and 255 do but I get confused when there is any number other than these two. For example... network 10.0.0.0 0.7.255.255 area 0 what does the 7 represent or specifiy for the mask.

Re: Inverse Mask

It represents the netmask (255.248.0.0) for the network. The easiest way to get from an inverse mask to a regular netmask is like this: 255.255.255.255 fill 'er up - 000.007.255.255 subtract the inverse mask --- 255.248.000.000 real netmask So, if you

RE: Inverse Mask

To: [EMAIL PROTECTED] Subject: Inverse Mask I need help in understanding inverse masks that are used in network access list commands. I understabd what 0 and 255 do but I get confused when there is any number other than these two. For example... network 10.0.0.0 0.7.255.255 area 0 what does the 7

Re: Inverse Mask

thanks j never thought of it that way used to do it the long way Duck - Original Message - From: J Rowley [EMAIL PROTECTED] To: Keith Townsend [EMAIL PROTECTED] Cc: [EMAIL PROTECTED] Sent: Tuesday, October 24, 2000 10:44 AM Subject: Re: Inverse Mask It represents the netmask

Re: Inverse Mask

MAIL PROTECTED]... thanks j never thought of it that way used to do it the long way Duck - Original Message - From: J Rowley [EMAIL PROTECTED] To: Keith Townsend [EMAIL PROTECTED] Cc: [EMAIL PROTECTED] Sent: Tuesday, October 24, 2000 10:44 AM Subject: Re: Inverse Mask

Re: Inverse Mask

. thanks j never thought of it that way used to do it the long way Duck - Original Message - From: J Rowley [EMAIL PROTECTED] To: Keith Townsend [EMAIL PROTECTED] Cc: [EMAIL PROTECTED] Sent: Tuesday, October 24, 2000 10:44 AM Subject: Re: Inverse Mask

RE: Inverse Mask

have a look at: - http://www.cursos.telemidia.puc-rio.br/cursos_cce/cursotcp/CIDR-FAQ.HTM - http://www.learntosubnet.com/ - http://www.3com.com/nsc/501302s.html - www.itprc.com/tcp_ip.htm In your below example, the "7" is an inverse mask for 248. (255-7=248) Irwin -Origin

Re: Inverse Mask

Here's the math.. 255.255.255.255 -mask you'd expect --- inverse mask so, the 0.7.255.255 inverse mask is what you'd typically see as a 255.248.0.0 subnet Brian On Tue, 24 Oct 2000, Keith Townsend wrote: I need help in understanding inverse masks that are used

Re: Inverse Mask

TED] Sent: Tuesday, October 24, 2000 6:34 PM Subject: Re: Inverse Mask Sorry. Let me correct this: Implement an access-list to block only the odd numbers (4th octet) of 123.12.10.x Thanks, Billy ""Billy Monroe"" [EMAIL PROTECTED] wrote in message 8t52r7$2g9$[

Re: Inverse Mask

0.7.255.255 is like .0111.. In that case, your mask starts where the 1's start. MGR Keith Townsend wrote: I need help in understanding inverse masks that are used in network access list commands. I understabd what 0 and 255 do but

Re: Inverse Mask

. "network 10.0.0.0 0.7.255.255 area 0" Brian From: "Keith Townsend" [EMAIL PROTECTED] Reply-To: "Keith Townsend" [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: Inverse Mask Date: Tue, 24 Oct 2000 11:15:10 -0500 I need help in understanding inverse masks that are

Re: Inverse Mask

Remember that with ACL masks, 1s = don't care. so, for a mask of 0.7.255.255 you have - .0111.. so, when used with 10.0.0.0 - You have to have 10 in the first octet (no ones) It doesn't care what is in the 3rd and 4th octet (all ones) The

Re: Inverse Mask

long way Duck - Original Message - From: J Rowley [EMAIL PROTECTED] To: Keith Townsend [EMAIL PROTECTED] Cc: [EMAIL PROTECTED] Sent: Tuesday, October 24, 2000 10:44 AM Subject: Re: Inverse Mask It represents the netmask (255.248.0.0) for the ne

Re: Inverse Mask

Hi Keith, What I find helpful is to do this for inverse masks: Just subtract the number from 255. So for your 7, it will be 255-7 which is 248. Hope that helps Helena On Tue, 24 Oct 2000, Keith Townsend wrote: I need help in understanding inverse masks that are used in network access