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No, DNS round robin has ... issues. With SRV, you can set a priority, so it goes to a set of hosts first, then falls back. You can also weight traffic so that
by mugsie 10y ago
No, DNS round robin has ... issues.
With SRV, you can set a priority, so it goes to a set of hosts first, then falls back.
You can also weight traffic so that some hosts get more than others.
(also host is actually an A (or AAAA) record - so it could have multiple values as well)
> Also with software defined networking load balancing you can have one user facing ip be backed by many servers.
Sure - but software defined (or normal) load balancing is usually inside the datacenter or region. Its another tier behind the DNS layer.
- teddyh 10y agoAlso, DNS round robin won’t work with IPv6. At all. Round robin DNS depends on a client connecting to the first address record it receives in the DNS reply, and the DNS server altering its responses to set different addresses as the first one each time it sends a DNS response. But with IPv6, a client host is required to connect to the address closest to its own (as determined by the longest range of common bits), regardless of the adress’ position in the DNS reply.