NNMi and Firewall Connections Monitoring

One thing that is sometimes overlooked on firewalls is the connection count. Badly written applications or incorrect firewall configurations can mean that the connections table becomes saturated, causing disconnections, connection failures and a myriad of other problems. This can result in people running tests, seeing packet loss, and concluding that … Continue reading

CentOS Mail Client via Postfix Relay

There was a need for one of my VPSs to be able to send mail externally via my Postfix Mailserver which is running on another box. Simple enough:

Client:

# yum install sendmail # vi /etc/sysconfig/sendmail DAEMON=no # vi /etc/mail/submit.cf D{MTAHost}mailserver.mydomain.com

Mail Server:

# vi /etc/postfix/main.cf

Add the following to … Continue reading