SanDisk Ultra Micro SDHC vs SanDisk Mobile Ultra Micro SDHC

SanDisk Mobile Ultra Micro SDHC SanDisk Ultra Micro SDHC There’s no differences in term of performance or physical appearance. I found this solid answer: I rang Technical Support at SanDisk to ask what’s the difference between “Mobile Ultra” and “Ultra” “Mobile Ultra” and “Ultra” are the same card, the name difference was just for marketing… Read More »

Determine supported SSL Cipher Suite for particular web server.

What is SSL Cipher Suite? A cipher suite is a named combination of authentication, encryption, message authentication code (MAC) and key exchange algorithms used to negotiate the security settings for a network connection using the Transport Layer Security (TLS) / Secure Sockets Layer (SSL) network protocol Below bash script gets a list of supported cipher… Read More »

Microsoft VPN PPTP client through Cisco ASA Firewall

Scenario: Using Microsoft Windows built in VPN Client to connect to remote PPTP VPN server through Cisco ASA firewall. Symptom: Error 619 Solution: In ASA Firewall, enter below command. ASA-active#conf t ASA-active(config)#policy-map global_policy ASA-active(config-pmap)# class inspection_default ASA-active(config-pmap-c)#inspect pptp ASA-active(config-pmap-c)#exit ASA-active(config)#access-list $Inbound_Interface_ACL permit gre $source_ip/network any ASA-active(config)#access-list $Inbound_Interface_ACL permit permit tcp $source_ip/network any eq pptp Common… Read More »

Graylog2: “Could not bind UDP syslog input to address /0.0.0.0:514”

Problem Received error “Could not bind UDP syslog input to address /0.0.0.0:514, Failed to bind to: /0.0.0.0:514, Address already in use” when adding log input using UDP 514 (default syslog port). Explanation In UNIX/LINUX, assigned port 1024 and below require root privilege. Either you run graylog2 as root (not recommended) or follow below workaround. Solution… Read More »

Microsoft Windows Server 2012 DHCP

Scenario I have 4 dhcp server (in 2 failover cluster) running in Windows Server 2012 R2 with Mac filter enabled. Problem Failover cluster will not synchronize Mac filter database, for adding new record we have to do it manually in all dhcp server. Solution PowerShell script to add Mac filter to multiple server [code language=”powershell”]$mac… Read More »