|
|||||
|
On a current project I was tasked with fixing a broken standby supervisor card in a 4500 series switch and thought I would share the experience and the fix applied. For those of you not familiar, the Standby Supervisor cards provide your chassis with redundancy on your primary (and most vital) links on your . . . → Read More: Cisco Standby Supervisor FIX The Spanning Tree Protocol is an OSI layer-2 protocol that ensures a loop-free topology for any bridged LAN. Spanning tree allows a network design to include spare (redundant) links to provide automatic backup paths if an active link fails, without the danger of bridge loops, or the need for manual enabling/disabling of these backup . . . → Read More: Preventing STP forwarding loops Contents Introduction Prerequisites Requirements Components Used Background Information Platforms That Use Errdisable Errdisable Function of Errdisable Causes of Errdisable Determine If Ports Are in the Errdisabled State Determine the Reason for the Errdisabled State (Console Messages, Syslog, and the show errdisable recovery Command) Recover a Port from Errdisabled State Correct the Root Problem . . . → Read More: Troubleshooting Errdisable Ports on Cisco /etc/rsyslog.conf Uncomment these lines, since RouterOS sends log via UDP on port 514: $ModLoad imudp $UDPServerRun 514 /etc/rsyslog.d/50-default.conf Add line(s): :fromhost-ip,isequal,”192.168.x.1″ /var/log/mikrotik-Router1.log :fromhost-ip,isequal,”192.168.x.2″ /var/log/mikrotik-Router2.log Restart the rsyslog service: sudo service rsyslog restart Various ways to view logs: System Log Viewer (GUI) Terminal: tail -f /var/log/mikrotik-Router1.log * Don’t forget to allow IP traffic through firewall . . . → Read More: MikroTik remote logging using rsyslog Today we will upgrade the IOS version on both WS-X4516 supervisor engines V in a WS-C4507R chassis. This blog post assumes that your 4507R chassis’s supervisor engine already has network support for you to SSH into it. First, go to the Cisco support site and download the latest IOS version (you need . . . → Read More: IOS Upgrade on Cisco WS-C4507R Chassis with Dual Supervisor V Engines Here is my favorite set of commands to get those beasts up and running Continue reading So You bought Dell PowerConnect 64xx Switches For Your Equallogic Me and my colleagues at work were facing a problem. We’re using a VPN to access our internal servers and for some reason Mac OS X always uses a 24 bit netmask with the VPN connection (when we need a 16 bit). Of course there’s a solution for this. Open your favourite text editor. . . . → Read More: Adding a custom route to a VPN in Mac OS X After the brief overview about the installation of flow-tools and FlowViewer, in this post I’d like to share my experience about the setup of a basic solution based on another pair of tools: NFDUMP and NfSen. As always on my posts, the starting point is a fresh Debian 5.0 setup. Continue reading NetFlow: installation and configuration of NFDUMP and NfSen on Debian How to check mail queue? $postqueue -p How to flash/resend the queue mails? $postqueue -f How to check the basic config? $postconf -n How to check whole config? $postconf How to make all queue as renew queue? Continue reading Postfix cheat-sheet P disable_vrfy_command = yes : Disable the SMTP VRFY command. This stops some techniques used to harvest email addresses. smtpd_delay_reject = yes : It allows Postfix to log recipient address information when rejecting a client name/address or sender address, so that it is possible to find out whose mail is being rejected. smtpd_helo_requi |
|||||
|
Copyright © 2024 The_Dev_Crypt - All Rights Reserved |
|||||
Comments are closed 
ostfix is free and powerful MTA. You can easily configure Postfix to block spam. You need to add following directives to /etc/postfix/main.cf file: