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	<title>Networking Blog</title>
	<atom:link href="http://www.net-gyver.com/?feed=rss2" rel="self" type="application/rss+xml" />
	<link>http://www.net-gyver.com</link>
	<description>Just another weblog about networking stuff</description>
	<pubDate>Fri, 28 May 2010 17:44:38 +0000</pubDate>
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			<item>
		<title>Configuring VRRP on a Juniper SSG</title>
		<link>http://www.net-gyver.com/?p=1379</link>
		<comments>http://www.net-gyver.com/?p=1379#comments</comments>
		<pubDate>Fri, 26 Feb 2010 18:43:29 +0000</pubDate>
		<dc:creator>admin</dc:creator>
		
		<category><![CDATA[Juniper]]></category>

		<guid isPermaLink="false">http://www.net-gyver.com/?p=1379</guid>
		<description><![CDATA[A few weeks ago, i was confronted with a Juniper Secure Services Gateway (aka SSG) for the first time. After playing a little bit with the box, i quickly learned to like her.
Okay, it took a time to get used to the CLI with its behaviour and the Virtual-System/-Router stuff, but the WebUI is very [...]]]></description>
		<wfw:commentRss>http://www.net-gyver.com/?feed=rss2&amp;p=1379</wfw:commentRss>
		</item>
		<item>
		<title>Using two HWIC-4ESW in a Cisco 1841</title>
		<link>http://www.net-gyver.com/?p=1366</link>
		<comments>http://www.net-gyver.com/?p=1366#comments</comments>
		<pubDate>Wed, 24 Feb 2010 21:03:46 +0000</pubDate>
		<dc:creator>admin</dc:creator>
		
		<category><![CDATA[Cisco]]></category>

		<category><![CDATA[hardware]]></category>

		<category><![CDATA[switching]]></category>

		<guid isPermaLink="false">http://www.net-gyver.com/?p=1366</guid>
		<description><![CDATA[Recently, there was a need for additional FastEthernet ports on a Cisco 1841. The router had already one  HWIC-4ESW attached, but all ports were occupied.
Fortunately, there was a second HWIC-4ESW at stock which was inserted immediately. Two additional ports was configured quickly to a vlan already in use on the other HWIC.
But then the problem [...]]]></description>
		<wfw:commentRss>http://www.net-gyver.com/?feed=rss2&amp;p=1366</wfw:commentRss>
		</item>
		<item>
		<title>Configuring Resilient Ethernet Protocol</title>
		<link>http://www.net-gyver.com/?p=1339</link>
		<comments>http://www.net-gyver.com/?p=1339#comments</comments>
		<pubDate>Mon, 21 Sep 2009 22:39:13 +0000</pubDate>
		<dc:creator>admin</dc:creator>
		
		<category><![CDATA[Cisco]]></category>

		<category><![CDATA[bridging]]></category>

		<category><![CDATA[REP]]></category>

		<guid isPermaLink="false">http://www.net-gyver.com/?p=1339</guid>
		<description><![CDATA[Resilient Ethernet Protocol (REP) is a Cisco propietary protocol which allows you to build redundant Ethernet rings. It&#8217;s an alternative to Spanning-Tree protocol and also avoids bridging loops or responds to link failures.
Compared to STP, it offers a faster convergence time (&#60; 300ms) and gives you a simple VLAN load-balancing method.
In our example, we interconnect [...]]]></description>
		<wfw:commentRss>http://www.net-gyver.com/?feed=rss2&amp;p=1339</wfw:commentRss>
		</item>
		<item>
		<title>Well-known multicast addresses</title>
		<link>http://www.net-gyver.com/?p=1324</link>
		<comments>http://www.net-gyver.com/?p=1324#comments</comments>
		<pubDate>Mon, 07 Sep 2009 21:11:51 +0000</pubDate>
		<dc:creator>admin</dc:creator>
		
		<category><![CDATA[General]]></category>

		<category><![CDATA[multicast]]></category>

		<guid isPermaLink="false">http://www.net-gyver.com/?p=1324</guid>
		<description><![CDATA[A lot of dynamic routing protocols uses ip multicast for neighbor discovery, hellos and other things.
Here are some well known multicast adresses:

224.0.0.1 all hosts on a subnet
224.0.0.2 all routers on a subnet
224.0.0.4 Distance Vector Multicast Routing Protocols (DVMRP)
224.0.0.5 OSPF routers
224.0.0.6 OSPF designated routers
224.0.0.9 RIP Version 2 routers
224.0.0.10 EIGRP routers
224.0.0.13 Protocol independent Multicast (PIM) routers

]]></description>
		<wfw:commentRss>http://www.net-gyver.com/?feed=rss2&amp;p=1324</wfw:commentRss>
		</item>
		<item>
		<title>How to enable IP Forwarding in Debian</title>
		<link>http://www.net-gyver.com/?p=1317</link>
		<comments>http://www.net-gyver.com/?p=1317#comments</comments>
		<pubDate>Mon, 20 Jul 2009 21:36:42 +0000</pubDate>
		<dc:creator>admin</dc:creator>
		
		<category><![CDATA[Debian]]></category>

		<category><![CDATA[management]]></category>

		<category><![CDATA[routing]]></category>

		<guid isPermaLink="false">http://www.net-gyver.com/?p=1317</guid>
		<description><![CDATA[IP routing/forwarding is disabled per default in Debian.
For enabling on the fly, you only have to write &#8220;1&#8243; in /proc/sys/net/ipv4/ip_forward or to set the kernel parameter net.ipv4.ip_forward to &#8220;1&#8243;.

Method #1:
echo 1 &#62; /proc/sys/net/ipv4/ip_forward
Method #2:
sysctl -w net.ipv4.ip_forward=1

The actual setting can be checked as following:

debian:~# sysctl net.ipv4.ip_forward
net.ipv4.ip_forward = 1
debian:~# cat /proc/sys/net/ipv4/ip_forward
1
debian:~#

If you want permanent setting, the most [...]]]></description>
		<wfw:commentRss>http://www.net-gyver.com/?feed=rss2&amp;p=1317</wfw:commentRss>
		</item>
		<item>
		<title>Interface range macro</title>
		<link>http://www.net-gyver.com/?p=1312</link>
		<comments>http://www.net-gyver.com/?p=1312#comments</comments>
		<pubDate>Sat, 11 Jul 2009 20:49:51 +0000</pubDate>
		<dc:creator>admin</dc:creator>
		
		<category><![CDATA[Cisco]]></category>

		<category><![CDATA[management]]></category>

		<guid isPermaLink="false">http://www.net-gyver.com/?p=1312</guid>
		<description><![CDATA[I often use the feature interface-range on Cisco switches running IOS.
Not so long ago, i discovered the command interface-range macro, from which i never heard before.
With this macro, you can group several interfaces together and address them by a significant name.
Short example:

define interface-range UPLINKS FastEthernet0/1, FastEthernet0/24
define interface-range USERPORTS FastEthernet0/2 - 23

Usage:

switch#conf t
switch(config)#interface range macro USERPORTS
switch(config-if-range)#switchport [...]]]></description>
		<wfw:commentRss>http://www.net-gyver.com/?feed=rss2&amp;p=1312</wfw:commentRss>
		</item>
		<item>
		<title>Bringing up an interface without an IP address</title>
		<link>http://www.net-gyver.com/?p=1307</link>
		<comments>http://www.net-gyver.com/?p=1307#comments</comments>
		<pubDate>Wed, 08 Jul 2009 19:00:48 +0000</pubDate>
		<dc:creator>admin</dc:creator>
		
		<category><![CDATA[Debian]]></category>

		<category><![CDATA[management]]></category>

		<guid isPermaLink="false">http://www.net-gyver.com/?p=1307</guid>
		<description><![CDATA[To create a network interface without an IP address at all use the manual method and use pre-up and post-down commands to bring the interface up and down.
This can be necessary, when you like to bridge a VMWare VM to this interface or when it&#8217;s connected to a mirror port on the switch for sniffing [...]]]></description>
		<wfw:commentRss>http://www.net-gyver.com/?feed=rss2&amp;p=1307</wfw:commentRss>
		</item>
		<item>
		<title>apt - Fix GPG error</title>
		<link>http://www.net-gyver.com/?p=1302</link>
		<comments>http://www.net-gyver.com/?p=1302#comments</comments>
		<pubDate>Fri, 03 Jul 2009 21:20:38 +0000</pubDate>
		<dc:creator>admin</dc:creator>
		
		<category><![CDATA[Debian]]></category>

		<guid isPermaLink="false">http://www.net-gyver.com/?p=1302</guid>
		<description><![CDATA[When doing an apt-get update to refresh index files from their sources, the indexes of available packages are fetched from the location(s) specified in /etc/apt/sources.list
Sometimes you will see an error like that:

debian:~# apt-get update
Get:1 http://www.backports.org etch-backports Release.gpg [189B]
Hit http://www.backports.org etch-backports Release    
~             
~
(output shortened)
~
~
Hit http://security.debian.org etch/updates/contrib Packages
Hit http://security.debian.org etch/updates/main Sources
Hit http://security.debian.org etch/updates/contrib Sources
Fetched 180kB in 2s (75.2kB/s)
Reading [...]]]></description>
		<wfw:commentRss>http://www.net-gyver.com/?feed=rss2&amp;p=1302</wfw:commentRss>
		</item>
		<item>
		<title>Building a customized menu</title>
		<link>http://www.net-gyver.com/?p=1294</link>
		<comments>http://www.net-gyver.com/?p=1294#comments</comments>
		<pubDate>Tue, 30 Jun 2009 13:32:05 +0000</pubDate>
		<dc:creator>admin</dc:creator>
		
		<category><![CDATA[Cisco]]></category>

		<category><![CDATA[aaa]]></category>

		<category><![CDATA[management]]></category>

		<category><![CDATA[miscellaneous]]></category>

		<guid isPermaLink="false">http://www.net-gyver.com/?p=1294</guid>
		<description><![CDATA[Recently i stumbled across a nice feature in Cisco IOS for building customized menus.
The &#8220;menu&#8221;-command is really old and was introduced in IOS 10.0
You can i.e. use it for building a menu for CLI-unexperienced staff to simplify troubleshooting.
First of all, you have to configure a little bit AAA  as well as create a user with [...]]]></description>
		<wfw:commentRss>http://www.net-gyver.com/?feed=rss2&amp;p=1294</wfw:commentRss>
		</item>
		<item>
		<title>Solaris Network Configuration</title>
		<link>http://www.net-gyver.com/?p=1275</link>
		<comments>http://www.net-gyver.com/?p=1275#comments</comments>
		<pubDate>Fri, 26 Jun 2009 11:58:48 +0000</pubDate>
		<dc:creator>admin</dc:creator>
		
		<category><![CDATA[General]]></category>

		<category><![CDATA[solaris]]></category>

		<guid isPermaLink="false">http://www.net-gyver.com/?p=1275</guid>
		<description><![CDATA[Solaris Network configuration is a little bit different to Debian.
Because i always forget it, there&#8217;s a quick explanation of the necessary steps (taken from here and used with Solaris 5,6,7,8 +9).
/etc-Files
All configuration data, such as IP addresses, gateways, and so on, can be defined and changed at runtime level.
But first of all you have to [...]]]></description>
		<wfw:commentRss>http://www.net-gyver.com/?feed=rss2&amp;p=1275</wfw:commentRss>
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