Troubleshooting DHCP issues

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Home > CentOS > CentOS 6.x > Dhcp server configuration > Troubleshooting DHCP issues

Restrictive firewall issue

DHCP will not work if outgoing packets to UDP port 67 are not allowed in firewall. In such cases messages: 

Failed to send 300 byte long packet over fallback interface

might get appended to /var/log/messages and monitoring systems should pick up these as unknown message. The problem can be easily resolved by updating firewall to allow outgoing packets to UDP port 67.



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