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Private VLANs Revisited

Mon, 14 Jul 2008 16:14:28 +0000
Due to the non-decreasing interest to the post about Private VLANs, I decided to make another one, more detailed – including a diagram and verification techniques.
To begin with, look at the concept of VLAN as a broadcast domain. What Private VLANs (PVANs) do, is they split the domain into multiple isolated broadcast subdomains. It’s a ...]

IPIPGW Example

Sun, 30 Jul 2006 20:38:09 +0000
We setup a IPIPGW with 3 gatekeepers and 2 callmanagers.
IPPhone1—Callmanager 1—–GK1———–(IPIPGW/VIAZONEGK)———–GK2———Callmanager2—IPPhone2
GK1 configs:
int lo 0
ip address 172.12.100.1 255.255.255.0 
gatekeeper
 zone local HQ-RTR ipexpert.com 172.12.100.1
 zone remote VIAZONE ipexpert.com 10.12.200.2 1719
 zone prefix VIAZONE 20*
 gw-type-prefix 1#* default-technology
 no shutdown
!
GK2 Configs:
gatekeeper
 zone local LT-RTR ipexpert.com 192.168.10.46
 zone remote VIAZONE ipexpert.com 10.12.200.2 1719
 zone prefix VIAZONE 40*
 gw-type-prefix 1#* default-technology
 no shutdown
IPIPGW config:
 voice service voip
 allow-connections h323 to h323
dial-peer voice ...]

IEWB-DYN Lab 5 - Layer 2 Highlights

Sun, 17 Feb 2008 13:38:27 +0000
So I did the core section for Lab 5 this morning. The L2 section was quite straight forward - nothin

Full Directory Listing in Mac OS X

Tue, 17 Jun 2008 09:21:03 +0000
Ever wonder how to get your full directory tree into a text file in Mac OS X or any unix or linux env for that matter.
Paul from irc.linux.ie came up with a great way of doing it from one simple command:
find / > ~/tree.txt

IEWB-DYN Lab 5 - IGP Highlights

Sun, 17 Feb 2008 13:46:26 +0000
The IGP section again, was quite straight forward, with the usual OSPF over FR shenanigans going on,

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Update on updates

Wed, 12 Mar 2008 20:17:54 +0000
You may have noticed a distinct lack of updating on this site recently. I have been continuing with my lab practice, but am finding it harder and harder to write up notes to the blog.
I will be updating the site from time to time. I have booked a place on Narbik’s London Boot camp in ...]

ip igmp snooping for 224.0.0.0 to 224.0.0.255

Wed, 23 Apr 2008 10:32:38 +0000
I have read about this subnet range, it`s not possible to disable the snooping feature on a switch. So routing protocols (like OSPF or EIGRP) are always forwarded to other ports regardless the snooping feature. Is that true? Someone with more informations on that.
——————————————————
In general, addresses from 224.0.0.1 to 224.0.0.255 are reserved and used by ...]

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