Category Archives: Networking

sendmail dsn=5.6.0, stat=Data format error

Just faced this issue today and here are some tips on troubleshooting. My environment (RedHat 5.9 , sendmail-8.13.8-8.1.el5_7) While trying to send mail from command line and monitoring /var/log/maillog I could see that message was rejected with below error Not … Continue reading

Posted in Linux, Networking, sendmail | 1 Comment

Cheap inter vlan routing

I often find myself working on a systems that have multiple vlans and those vlans need to be able to talk to each other and that means that router or L3 switch is a must in such setup. Unfortunately while … Continue reading

Posted in Networking | Tagged | 1 Comment