My EtherealMind» Operation http://etherealmind.com Network design, architecture, thinking, working. Tech. Fri, 10 Feb 2012 17:47:09 +0000 en hourly 1 http://wordpress.org/?v=3.3.1 Using Underscores, Hyphens or CamelCase in Naming Standards http://etherealmind.com/using-underscores-hyphens-or-camelcase-in-naming-standards/ http://etherealmind.com/using-underscores-hyphens-or-camelcase-in-naming-standards/#comments Fri, 27 Jan 2012 17:05:32 +0000 Greg Ferro http://etherealmind.com/?p=6009 http://etherealmind.com/using-underscores-hyphens-or-camelcase-in-naming-standards/feed/ 7 Can Fibre Optic Ethernet Cables Be Longer Than the Standard ? http://etherealmind.com/can-fibre-optic-ethernet-cables-be-longer-than-the-standard/ http://etherealmind.com/can-fibre-optic-ethernet-cables-be-longer-than-the-standard/#comments Sun, 01 Jan 2012 19:41:10 +0000 Greg Ferro http://etherealmind.com/?p=5967 http://etherealmind.com/can-fibre-optic-ethernet-cables-be-longer-than-the-standard/feed/ 8 Responding: On Optimizing Traffic for Network Virtualization http://etherealmind.com/responding-on-optimizing-traffic-for-network-virtualization/ http://etherealmind.com/responding-on-optimizing-traffic-for-network-virtualization/#comments Fri, 23 Dec 2011 15:10:47 +0000 Greg Ferro http://etherealmind.com/?p=5955 http://etherealmind.com/responding-on-optimizing-traffic-for-network-virtualization/feed/ 14 ASA 5520 and ASA 5540 With Only One DIMM Memory Socket – Counterfeit Hardware http://etherealmind.com/asa-5520-and-asa-5540-with-only-one-dimm-memory-socket-counterfeit-hardware/ http://etherealmind.com/asa-5520-and-asa-5540-with-only-one-dimm-memory-socket-counterfeit-hardware/#comments Tue, 20 Dec 2011 14:54:32 +0000 Greg Ferro http://etherealmind.com/?p=5946 http://etherealmind.com/asa-5520-and-asa-5540-with-only-one-dimm-memory-socket-counterfeit-hardware/feed/ 1 Cisco Nexus NXOS and Fixing Broken “Switchto” Syntax With Alias http://etherealmind.com/cisco-nexus-nxos-switchto-changeto-syntax-cli/ http://etherealmind.com/cisco-nexus-nxos-switchto-changeto-syntax-cli/#comments Sun, 18 Dec 2011 20:05:28 +0000 Greg Ferro http://etherealmind.com/?p=5943 http://etherealmind.com/cisco-nexus-nxos-switchto-changeto-syntax-cli/feed/ 3 Fibre Connectors http://etherealmind.com/fibre-optic-connectors/ http://etherealmind.com/fibre-optic-connectors/#comments Thu, 14 Jul 2011 18:49:26 +0000 Greg Ferro http://etherealmind.com/?p=5735 http://etherealmind.com/fibre-optic-connectors/feed/ 16 Those Non-IOS Files on the Flash. Are They Useful ? http://etherealmind.com/ios-files-flash-useful-purpose-function/ http://etherealmind.com/ios-files-flash-useful-purpose-function/#comments Wed, 08 Jun 2011 18:15:36 +0000 Greg Ferro http://etherealmind.com/?p=5667 http://etherealmind.com/ios-files-flash-useful-purpose-function/feed/ 4 EIGRP Goodbye Message http://etherealmind.com/eigrp-goodbye-message/ http://etherealmind.com/eigrp-goodbye-message/#comments Sun, 29 May 2011 17:57:06 +0000 Greg Ferro http://etherealmind.com/?p=5639 http://etherealmind.com/eigrp-goodbye-message/feed/ 2 Show Ip Eigrp Topology All http://etherealmind.com/show-ip-eigrp-topology-all/ http://etherealmind.com/show-ip-eigrp-topology-all/#comments Sun, 22 May 2011 13:44:13 +0000 Greg Ferro http://etherealmind.com/?p=5623 http://etherealmind.com/show-ip-eigrp-topology-all/feed/ 0 PacketShaper and Flow Directions http://etherealmind.com/packetshaper-inbound-outbound-outside-inside/ http://etherealmind.com/packetshaper-inbound-outbound-outside-inside/#comments Sat, 14 May 2011 23:45:16 +0000 Greg Ferro http://etherealmind.com/?p=5607 initiated the three way handshake. For purposes here, the Client always initiates the TCP connection, and the Server terminates the connection.

TCP Session and Direction

Most people understand the three way handshake, but not many consider the direction of the session. Packet shaper flow directions 0
The connection from the client to the server is outbound, but is inbound on the server. And vice versa, the server outbound session is inbound on the client. Packet shaper flow directions 0 1 That's not very useful for being able to define the direction of flows.

Why is direction important ?

Direction of flows is important if you want to configure asymmetric rules. That is, not all protocols require symmetic bandwidth. For example, HTTP traffic is usually a 10:1 ratio for reply to request. That is, a request for this webpage is about 10KB, but the reply with the data, images and javascript is more than 100KB. Packet shaper flow directions 0 2 For an FTP upload server, you might have the reverse condition where the inbound traffic is far more than the outbound. To make the most of your Internet connection for this case, you could configure the inbound bandwidth on your Internet connection to be 80% FTP, 20% HTTP and the outbound bandwidth to be 20% FTP and 80% HTTP. This gives a far better utilisation, especially in regards to better TCP Windowing and overall TCP goodput.]]> http://etherealmind.com/packetshaper-inbound-outbound-outside-inside/feed/ 3 Why Firewalls Don’t Have Telnet or SSH Clients http://etherealmind.com/firewall-dont-ssh-telnet-server/ http://etherealmind.com/firewall-dont-ssh-telnet-server/#comments Fri, 13 May 2011 03:37:13 +0000 Greg Ferro http://etherealmind.com/?p=5593 Another missing ASA-feature: telnet and ssh client: " Every single decent Cisco-device on earth has the ability to make an CLI-user jump to another device with telnet or ssh. Except the ASA. I really wish that this feature could be added. Right now I am troubleshooting a firewall and from where I am right now the only way in is to SSH to the ASA. I can do whatever I want inside the firewall from my SSH-window, but I need to access a router inside of that firewall, and if this feature wasn´t missing i could simply run 'ssh ip-address' to jump to the switch´s CLI. Am I the last CLI-.guy on this planet? Please, Cisco? ]]> http://etherealmind.com/firewall-dont-ssh-telnet-server/feed/ 14 Fate Sharing, Failure Domains and Why VTP Is Awesome http://etherealmind.com/vtp-design-fate-sharing-failure-domains/ http://etherealmind.com/vtp-design-fate-sharing-failure-domains/#comments Wed, 20 Apr 2011 15:00:10 +0000 Greg Ferro http://etherealmind.com/?p=5494 http://etherealmind.com/vtp-design-fate-sharing-failure-domains/feed/ 33 Fault Detection in Metro Ethernet http://etherealmind.com/fault-detection-metro-ethernet/ http://etherealmind.com/fault-detection-metro-ethernet/#comments Sat, 05 Mar 2011 17:08:20 +0000 Tony Brown http://etherealmind.com/?p=5077 http://etherealmind.com/fault-detection-metro-ethernet/feed/ 3 Citrix Branch Repeater Authentication With Cisco TACACS+ http://etherealmind.com/citrix-branch-repeater-authentication-with-cisco-tacacs/ http://etherealmind.com/citrix-branch-repeater-authentication-with-cisco-tacacs/#comments Fri, 04 Mar 2011 17:04:55 +0000 John McManus http://etherealmind.com/?p=5039 http://etherealmind.com/citrix-branch-repeater-authentication-with-cisco-tacacs/feed/ 2 Verifiying IPsec and SSL Performance of ASA Firewall http://etherealmind.com/verifying-ipsec-ssl-crypto-performance-cli/ http://etherealmind.com/verifying-ipsec-ssl-crypto-performance-cli/#comments Sun, 27 Feb 2011 15:37:30 +0000 Greg Ferro http://etherealmind.com/?p=5015 http://etherealmind.com/verifying-ipsec-ssl-crypto-performance-cli/feed/ 3 Cisco IP Traceroute Characters http://etherealmind.com/cisco-ip-traceroute-characters/ http://etherealmind.com/cisco-ip-traceroute-characters/#comments Fri, 25 Feb 2011 17:25:31 +0000 Greg Ferro http://etherealmind.com/?p=5000 http://etherealmind.com/cisco-ip-traceroute-characters/feed/ 0 Cisco IOS CLI Shortcuts http://etherealmind.com/cisco-ios-cli-shortcuts/ http://etherealmind.com/cisco-ios-cli-shortcuts/#comments Sun, 06 Feb 2011 18:02:01 +0000 Greg Ferro http://etherealmind.com/?p=4841 http://etherealmind.com/cisco-ios-cli-shortcuts/feed/ 17 Three Ways to Fix the Cisco IOS Translating “Xyz” Domain Server http://etherealmind.com/cisco-ios-translating-domain-server/ http://etherealmind.com/cisco-ios-translating-domain-server/#comments Thu, 27 Jan 2011 12:07:55 +0000 Greg Ferro http://etherealmind.com/?p=4738 http://etherealmind.com/cisco-ios-translating-domain-server/feed/ 10 TCAM – A Deeper Look and the Impact of IPv6 http://etherealmind.com/tcam-detail-review/ http://etherealmind.com/tcam-detail-review/#comments Wed, 26 Jan 2011 15:28:41 +0000 Greg Ferro http://etherealmind.com/?p=4727 http://etherealmind.com/tcam-detail-review/feed/ 14 So You Want to Use a 3750-X as a Router? http://etherealmind.com/so-you-want-to-use-a-3750-x-as-a-router/ http://etherealmind.com/so-you-want-to-use-a-3750-x-as-a-router/#comments Mon, 24 Jan 2011 22:04:47 +0000 John McManus http://etherealmind.com/?p=4712 http://etherealmind.com/so-you-want-to-use-a-3750-x-as-a-router/feed/ 7 Bluetooth Hangs in OSX 10.6.6 http://etherealmind.com/osx-bluetooth-reset-restart/ http://etherealmind.com/osx-bluetooth-reset-restart/#comments Mon, 17 Jan 2011 16:06:48 +0000 Greg Ferro http://etherealmind.com/?p=4616 http://etherealmind.com/osx-bluetooth-reset-restart/feed/ 4 Cisco IOS SX Storm Control http://etherealmind.com/cisco-storm-control/ http://etherealmind.com/cisco-storm-control/#comments Tue, 11 Jan 2011 13:31:38 +0000 Greg Ferro http://etherealmind.com/?p=4575 http://etherealmind.com/cisco-storm-control/feed/ 4 Putty – Fixing Right Click Paste http://etherealmind.com/putty-fixing-right-click-paste/ http://etherealmind.com/putty-fixing-right-click-paste/#comments Sun, 09 Jan 2011 14:07:01 +0000 Greg Ferro http://etherealmind.com/?p=4535 http://etherealmind.com/putty-fixing-right-click-paste/feed/ 7 Remote (in Band) Configuration Tips http://etherealmind.com/remote-in-band-configuration-tips/ http://etherealmind.com/remote-in-band-configuration-tips/#comments Thu, 23 Dec 2010 19:46:39 +0000 John McManus http://etherealmind.com/?p=4445 http://etherealmind.com/remote-in-band-configuration-tips/feed/ 17 RFC 5952 – A Recommendation for IPv6 Address Text Representation http://etherealmind.com/ipv6-5952-recommended-way-to-write-ipv6/ http://etherealmind.com/ipv6-5952-recommended-way-to-write-ipv6/#comments Tue, 31 Aug 2010 21:38:17 +0000 Greg Ferro http://etherealmind.com/?p=3841 http://etherealmind.com/ipv6-5952-recommended-way-to-write-ipv6/feed/ 3