This error message suddenly showed up on one of my router when I tried to save its running configuration. service compress-config allowed me to workaround this buffer problem :
There is a nice video tutorial to get your GNS3 lab connected to your physical network. However, it requires you to use a real network card with a fixed IP for doing that. This is not really handy if, llike me, you use GNS3 on a laptop whose connectivity is frequently switching between cable and [...]
GNS3 and Dynamips put together give a nice open-source and free alternative to emulate a network with IOS routers. Dynampis is an emulator of Cisco 7200 router, while GNS3 provides a nice graphical environment to design your network and use the virtual routers. I sometimes use Boson Netsim, which is not only non-free but not [...]
As I just finished setting TLS and SASL to secure the access to my Postfix server, I realized that it was working only from inside my network. What I got from my lan : I shows well that the TLS handshake is initiated. But from this outside, I just got this weired thing : Of [...]
Using the serial port is still necessary to manage some devices, when it is reseted to factory defaults. It could be also a security choice… Nowadays many computers – and especially laptops don’t have anymore a built-in serial port. Not a problem, there are many cheap serial-usb converters like this. As an alternative to the [...]
I found that it was a real mess to set up a FTP server in a DMZ, behind a firewall Cisco Asa (501 model with IOS version 7.0). The FTP server is on the DMZ area, and therefore I natted a public IP to the private IP in the DMZ subnet of this server. Doing [...]
After a fresh set up of your network, don’t be surprised that your ssh connections are slow.
I had a weired issue with a server. Whereas other machines worked well with an high speed Internet connection, dowloading was painfully slow on this one. The network card, a 3Com, was also different from others (Intel).
