The Insecure Wire

a network engineers perspective

Monthly Archives: August 2014

Cisco FXO Voice card disconnect issue

Recently i was working on setting up a branch office to use SRST PSTN failover as the site uses a SIP ITSP service via the WAN connection. So to give this small branch site some sort of redundancy the Cisco 2921 that i implemented came with x2 FXO VICs – giving me 4 ports total […]

Riverbed Steelhead Winbindd bug in RiOS 8.6

Recently i noticed an alarm issue with our Steelhead fleet. At random times the Steelhead appliances were losing trust relationship with the Windows Domain they are members of. This can be really bad, when the main reason your have a product like Riverbed Steelhead is cache chatty protocols such as Microsoft CIFS/SMB. A further look […]

Testing QoS with extended ping

Recently i have been working on a Cisco Telepresence Video roll out for my employer. One of the challenges i had was to configure QoS classes with the service provider – which manages our WAN. I provided to them what dscp (layer 3) tags the traffic would be marked as and how much bandwidth they […]