neutron/releasenotes/notes/dnsmasq-local-service-c8eaa91894a7d6d4.yaml
Jens Harbott 0fce3ca2c1 Secure dnsmasq process against external abuse
Currently any dhcp agent instance will work as an open resolver. For
deployments using publicly routed addresses for tenant networks, this
allows the agent being abused in dDoS attacks, see [1].

By setting the `--local-service` option dnsmasq will filter DNS queries
and reply only to queries from directly attached networks.

[1] https://bugs.launchpad.net/neutron/+bug/1501206

Closes-Bug: 1501206
Change-Id: I76d810aad2ce0f15a88bd798963012fa0efca74e
2018-11-28 15:49:25 -05:00

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fixes:
- |
Fixes bug `1501206 <https://bugs.launchpad.net/neutron/+bug/1501206>`_.
This ensures that DHCP agent instances running dnsmasq as a DNS server
can no longer be exploited as DNS amplifiers when the tenant network is
using publicly routed IP addresses by adding an option that will allow
them to only serve DNS requests from local networks.