EVO responds to SNMP requests towards Network/broadcast addresses.
Whereas Junos do not responds to them.
address 192.16.155.29/30
# snmpwalk -v2c -c public 192.16.155.28 .1.3.6.1.2.1.1.1
SNMPv2-MIB::sysDescr.0 = STRING: Juniper PTX10001-36MR - EE1 Meyrin
# snmpwalk -v2c -c public 192.16.155.29 .1.3.6.1.2.1.1.1
# snmpwalk -v2c -c public 192.16.155.31 .1.3.6.1.2.1.1.1
There seems to be difference in behaviour for directly connected WAN vs indirectly connected (via static routes).
Connection via static routes do not filter Network/Broadcast packets whereas dirtectly connected discards network address UDP packets.
As per https://datatracker.ietf.org/doc/rfc2644/,
A router MAY originate Network Directed Broadcast packets. A router MAY have a configuration option to allow it to receive directed broadcast packets, however this option MUST be disabled by default, and thus the router MUST NOT receive Network Directed Broadcast packets unless specifically configured by the end user.
On EVO, This will be handled at JTD via RLI #59699.