Did you get the following output trying to set a port in trunk mode on a Cisco IOS powered switch? SWITCH(config-if)#switchport mode trunk Command rejected: An interface whose trunk encapsulation is “Auto” can not be configured to “trunk” mode. This is because you are missing the encapsulation type (likely to be 802.1Q) on that port.… Read More »
In some rare occasion, you may be unable to access the OpenVPN WebUI through the standard port tcp-943 after a brand new installation. In my particular case, it happened once with CentOS 7. This is caused by the init script that does not ran properly. To resolve this matter, just invoke the init script manually… Read More »
Here is how to remotely copy your Brocade device running FabricOS to a remote TFTP server. To copy the currently running configuration : copy startup-config tftp <TFTP_Server_IP> startup-config.cfg To copy the configuration saved to the flash memory : copy run tftp <TFTP_Server_IP> switch-name.cfg To restore the remote config to your device : copy tftp start <TFTP_Server_IP>… Read More »
Here is a quick reference chart on subnet size for IPv6 prefixes : CIDR Number of IPs /128 1 /127 2 /126 4 /125 8 /124 16 /123 32 /122 64 /121 128 /120 256 /119 512 /118 1,024 /117 2,048 /116 4,096 /115 8,192 /114 16,384 /113 32,768 /112 65,536 /111 131,072 /110 262,144… Read More »
As you probably noticed, the fan on the wireless model of Juniper SSG5 is known to be noisy over time and does not last very long (maybe a year or two if not in a dusty environment). Even though the device seem to be running fine fan less, I would not risk it on a… Read More »
Modern and performance/server grade network interface have the capability of using transmit and receive buffer description ring into the main memory. They use direct memory access (DMA) to transfer packets from the main memory to carry packets independently from the CPU. The usual default buffering values for regular desktop NICs are 256 or 512 bytes. High… Read More »
Here is the two procedures to reset your Juniper SSG ScreenOS device. The first method (if you have the password for your device) and serial connection to your device, you can do a software reset as followed. 1. Get your device serial number using the following command (or by reading the label on your device)… Read More »
Here is a quick how to restrict the availability of the WebUI to one or several interface VLan(s) and specify which remote/management IPs should be allowed to access it. 1. Set the web management service to the interface VLan you want it to answer from external requests (this example assume that the l3-interface vlan.10 will… Read More »
The following procedure is about reseting root password and preserve the current configuration on your Juniper device running JunOS. 1. As soon you see “Hit [Enter] to boot immediately, or space bar for command prompt.” message, just press the space bar as indicated : FreeBSD/PowerPC U-Boot bootstrap loader, Revision 2.1 (marcelm@apg-bbuild01.juniper.net, Wed Feb 6 11:23:55… Read More »
Here is two commands to wither block a single or group of IPs on the Windows Firewall using the command line. Please note that you will need elevated privileges to run these commands. 1. Block a single IP (or subnet*) netsh advfirewall firewall add rule name=”IP Block” dir=in interface=any action=block remoteip=<IP_Address>/32 *You will need to… Read More »