TCP timestamps, defined in RFC 1323, help TCP compute the round-trip time between the sender and receiver. Timestamp options include a 4-byte timestamp value, where the sender inserts its current value of its timestamp clock, and a 4-byte echo reply timestamp value, where the receiver generally inserts the most recent timestamp value that it has …
Monthly Archive: August 2015
Aug 21
How to synchronize part of configuration between ADX HA pair
Server Iron ADX load balancer allows you to configure whole SLB configuration between active and standby systems but what if you want to do it for specific part of configuration only. It this situation you can use command config-sync to send more specific slice of current configuration. Brocade ADX config-sync command on CLI ServerIronADX 1000(config)#config-sync …
Aug 21
HTML Cheat Sheet
HTML cheat sheet presents web page code structure, attributes and most commonly used markup tags.
Aug 21
HTTP Satus codes
When client open WWW page Web server returns HTTP code to the browser. Below are presented types of codes with brief descriptions for specific messages.
Aug 21
How to rewrite HTTP redirect 301 to 302 using iRules on F5 LTM
In this example we going to rewrite HTTP redirect on server response. Assume that client is trying to connect to website which has been moved to different location and as a result Apache or IIS is sending HTTP response code 301 (Permanent Redirect) but we want to change it to code 302 (Temporary Redirect). There …
Aug 21
iRule – 301 redirect on F5 LTM
In this example we going to redirect HTTP request coming for domain.com to http://www.domain.com using basic iRule. Configuration steps: 1) Login to load balancer’s GUI 2) Go to Local Traffic -> iRules -> iRule List and click Create 3) Assign Name for iRule and paste enter irule code into Definition field. Once done press Finished. …
Aug 21
How to deny access for servers in the same VLAN on Cisco switch
In this scenario we have two servers connected on the same VLAN so typically they will be able to communicate directly and do not pass default gateway where you could perform ACL filtering. To disallow network devices from direct communication use command “switchport protected” under interface configuration. Configuration Example: enable configure terminal ! interface FastEthernet0/1 …
Aug 20
Google hacks
Google hacking is nothing more than using built in ways to search or in fact query the search engine to provide specific output based on search criteria. Targeted search based on target type: INTITLE: INTEXT: INURL: FILETYPE: LINK: Funny bit: Type in Google phrase “do a barrel roll” or “zerg rush” and hit enter
Aug 20
License upgrade on Brocade ADX
In order to upgrade software license on Brocade ADX load balancer follow steps below: 1) Obtain and save software license file (XML file) and copy it to a TFTP server that can be accessed by the Serveriron ADX. 2) Use the console or Telnet/SSH connection to access the load balancer. 3) Issue the copy command …
Aug 20
Password recovery on Brocade ADX
There may be a situation when you need to recover lost login password for your load balancer. To do so follow steps below: 1) Connect console cable to serial connection and start terminal session 2) Reboot ADX and press “b” to break booting process and enter boot monitor mode. 3) Enter “no password” command to …