Author: René Jorissen

René Jorissen works as Solution Architect for QMonkeys in the Netherlands. Network Infrastructures are the primary focus. René works with equipment of multiple vendors, like HPE Networks, FortiNet, SentinelOne, Phished, Holm Security, Microsoft services and many more. René is Aruba Certified Edge Expert (ACEX #26), Aruba Certified Mobility Expert (ACMX #438), Aruba Certified ClearPass Expert (ACCX #725), Aruba Certified Design Expert (ACDX #760), CCNP R&S, FCNSP and Certified Ethical Hacker (CEF) certified. You can follow René on Twitter and LinkedIn.

Configuration Example, Management

XMODEM recovery speed

René Jorissen on March 30, 2009 • 0 Comments • Tags: #115200 #3560 #3750 #9600 #baud #flash #rate #recovery #speed #tftp #xmodem

Configuring switches and routers is regular work for me. But if I would like to configure a switch or a router, I have to be able to boot the specific device…. Today I had to configure some new Cisco Catalyst 3650(E) en 3750 switches. In total I had 16 switches to configure, but three of … Read More

Configuration Example, Switching

Link State Tracking

René Jorissen on March 9, 2009 • 0 Comments • Tags: #based #blade #err-disabled #group #link #on #portid #route #state #system #tracking #virtual

Last week a friend called me and told me he was having serious problems with his network. A complete blade environment wasn’t able to communicate with the rest of the network. I asked what changed in the network and he told me that he had added a VLAN to a trunk allowed lists. Because he … Read More

Other stuff...

Custom ringtones and SMS sounds on iPhone 3G

René Jorissen on February 10, 2009 • 5 Comments • Tags: #libraryringtones #3g #custom #iphone #itunes #jailbreak #m4r #openssh #openssl #ringtone #sms

I received an iPhone 3G with a new cell phone contract. I started to play a little with it and noticed that there are only a few ringtones on the iPhone. Of course you can get more ringtones, but you have to get them through iTunes and pay for them, and that is not my … Read More

Routing

Another NVRAM broken?

René Jorissen on January 28, 2009 • 2 Comments • Tags: #sys-4-nv_block_initfail #available #bad #compress-config #failed #file #information #no #number #nvram #open #space #startup-config

On Monday I visited another customer who had problems saving the running configuration of a Cisco devices. The devices involved were a Cisco 2620 and a Cisco 2610XM router. Both routers weren’t able to save their running configuration. Both routers show the following error-message: startup-config file open failed (Bad file number) By both routers I … Read More

Management, Switching

NVRAM corrupt or broken?

René Jorissen on January 24, 2009 • 0 Comments • Tags: #sys-7-nv_block_init #broken #corrupt #failed #geometry #initialized #nvram #nv_done #open #unable #verification

Today some of my colleagues and I “rebuild” an existing ESX with NetApp network. We change multiple VLAN’s and did a lot of reconfiguring. Unfortunately some other people were working on the power, so sometimes all equipment had to power down. After we did our job, we started testing the environment. All DMZ VM’s weren’t … Read More

Configuration Example, Routing

Policy NAT on Cisco router

René Jorissen on January 14, 2009 • 9 Comments • Tags: #address #based #cisco #dynamic #nat #network #policy #policy-based #router #static #translation

A colleague of mine had to implement an IPSec VPN tunnel from a customer to a supplier. The customer has a Cisco router for connecting to the Internet, so nothing special. The router is already setup and in production. Configuring an extra IPSec VPN tunnel isn’t very hard, the most important part is the negotiation … Read More