Hi,
rfc6762 has the following ...
11. Source Address Check
All Multicast DNS responses (including responses sent via unicast)
SHOULD be sent with IP TTL set to 255. This is recommended to
provide backwards-compatibility with older Multicast DNS queriers
(implementing a draft version of this document, posted in February
2004) that check the IP TTL on reception to determine whether the
packet originated on the local link. These older queriers discard
all packets with TTLs other than 255.
John
On 25/09/17 16:44, Philipp Meier wrote:
Hi,
When using umdns I was wondering why my mDNS query did not get any
answer.
I found the following reason:
My mDNS query has TTL field set to 1. But LEDE umdns package expects a
TTL value of 255 (see interface.c function read_socket4).
According
https://www.systutorials.com/docs/linux/man/5-avahi-daemon.conf/ (see
check-response-ttl) this was necessary security behavior in older mDNS
versions but will be incompatible with newer versions of mDNS
implementations.
Therefore my question here is: Is this by purpose restricted to 255 by
LEDE umdns package or could this be changed?
Regards
Philipp
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