[avahi] Reg: Avahi publishing SRV records

[Trent Lloyd]

Can you attach a pcap file showing the relevant packets?

- Trent

> On 26 Sep 2019, at 6:46 am, Sharath Naeni <cs09b021 at gmail.com> wrote:
> 
> 
> Hello All,
> 
> We have a local network of 50 nodes which are publishing on avahi(with no flags, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC). We have noticed that avahi-daemon is using (>100%) CPU and goes into bad state. (avahi-browse complains "Daemon connection timedout")
> 
> So we did a tcpdump of packets received by a node and observed that each node in addition to publishing PTR record with it's own service, also publishing SRV record with details of other 49 nodes. This increased the avahi traffic in the network and we think that heavy traffic is causing avahi-daemon to go into bad state.
> 
> We would like to understand why:
> 1. Avahi-daemon is publishing SRV records and is there any way to disable this functionality.
> 2. From source code, we noticed that avahi-daemon does process SRV records and hence too many SRV records in the network is causing avahi-daemon hung. Is our hypothesis correct?
> 
> Version (avahi-daemon 0.6.31)
> publish-aaaa-on-ipv4=no
> publish-a-on-ipv6=no
> [reflector]
> enable-reflector=no
> reflect-ipv=no
> 
> Thanks in advance. Any insights would be great help to us.
> 
> Regards.
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