I have some hosts with FS running. One of them working under FreeBSD, other - Debian. FreeBSD host produce next: 15:26:47.173490 IP (tos 0x0, ttl 1, id 54112, offset 0, flags [none], proto UDP (17), length 1276) 225.1.1.1.4242 > 225.1.1.1.4242: [udp sum ok] UDP, length 1248 E....`......................Event-Name: HEARTBEAT Core-UUID: 688a4808-a986-e411-820a-005056a83c1f FreeSWITCH-Hostname: switch.xxx.com FreeSWITCH-Switchname: switch.xxx.com FreeSWITCH-IPv4: xxx.xxx.xxx.36 FreeSWITCH-IPv6: %3A%3A1 Event-Date-Local: 2014-12-18%2015%3A26%3A47 Event-Date-GMT: Thu,%2018%20Dec%202014%2012%3A26%3A47%20GMT Event-Date-Timestamp: 1418905607153759 Event-Calling-File: switch_core.c Event-Calling-Function: send_heartbeat Event-Calling-Line-Number: 70 Event-Sequence: 1808 Event-Info: System%20Ready Up-Time: 0%20years,%200%20days,%200%20hours,%2057%20minutes,%2059%20seconds,%20720%20milliseconds,%20943%20microseconds FreeSWITCH-Version: 1.5.15b%2Bgit~20141218T070405Z~d786490584~64bit Uptime-msec: 3479720 Session-Count: 0 Max-Sessions: 1000 Session-Per-Sec: 30 Session-Per-Sec-Max: 0 Session-Per-Sec-FiveMin: 0 Session-Since-Startup: 0 Session-Peak-Max: 0 Session-Peak-FiveMin: 0 Idle-CPU: 100.000000 Multicast-Sender: switch.xxx.com and Debian produce: 15:26:34.703154 IP (tos 0x0, ttl 1, id 51929, offset 0, flags [DF], proto UDP (17), length 1308) xxx.xxx.xxx.40.4242 > 225.1.1.1.4242: [udp sum ok] UDP, length 1280 E.....@...P....(............Event-Name: HEARTBEAT Core-UUID: 9716f838-8079-11e4-8285-41b93eb8ef1c FreeSWITCH-Hostname: voip-switch-01.xxx.com FreeSWITCH-Switchname: voip-switch-01.xxx.com FreeSWITCH-IPv4: xxx.xxx.xxx.40 FreeSWITCH-IPv6: %3A%3A1 Event-Date-Local: 2014-12-18%2015%3A26%3A44 Event-Date-GMT: Thu,%2018%20Dec%202014%2012%3A26%3A44%20GMT Event-Date-Timestamp: 1418905604180868 Event-Calling-File: switch_core.c Event-Calling-Function: send_heartbeat Event-Calling-Line-Number: 69 Event-Sequence: 29748434 Event-Info: System%20Ready Up-Time: 0%20years,%207%20days,%2021%20hours,%2052%20minutes,%2039%20seconds,%20971%20milliseconds,%20109%20microseconds FreeSWITCH-Version: 1.4.13%2Bgit~20141024T064225Z~e8a01c97f9~64bit Uptime-msec: 683559971 Session-Count: 0 Max-Sessions: 1000 Session-Per-Sec: 30 Session-Per-Sec-Max: 6 Session-Per-Sec-FiveMin: 0 Session-Since-Startup: 3827 Session-Peak-Max: 6 Session-Peak-FiveMin: 0 Idle-CPU: 99.500000 Multicast-Sender: voip-switch-01.xxx.com The difference is in source address of packets, and packets from FreeSWITCH, started on FreeBSD are not accepted by FS on linux Where must I find for solution of this problem? -- with best regards, Dmitriy Borisov