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RFC compliant dynamic DNS (not DDNS based on external updates like a HTTP channel) can be complicated to troubleshoot.

Below is a simplified description of the dynamic update process with information of common issues in each step that can lead to a dynamic DNS update failure.

One of these is called the master or primary and the ‘copies’ are called slave or secondary servers.

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One such proposed method is called dper: the DNS Peering Protocol which has an extra XML configuration that needs to be transported (somehow) to the slaves.

If BIND is your master, you could use BIND’s statistics server and, as Tony points out in the comments below, Paul Vixie’s metazones solve the “transport” of a zone list as well.

It is very important when troubleshooting dynamic updates on Unix BIND or MS DNS Servers to have DNS logging enabled, esp.

to see the Update, Notify and Zonetransfer pakets in the logs.

To troubleshoot this process, enable query logging, update logging, xfer in/out logging and notify logging on all DNS Servers that host the zone and verify that the flow of DNS packets described in steps 1-5 can be seen in the logs in the correct order.

DNS zones are typically served by more than one server.

Once the primary master has processed the dynamic update and modified the zone, the slaves can get a new copy of it via zone transfers.

Dynamic update permits more than the simple addition and deletion of records.

The problem lies with serial which is not updated to current date and number of changes per each day after a zone is changed......

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