Quote:

Can you strace the java process, or is that just asking for trouble? Is the Jemplode host multi-homed?



strace on it seems to work. I wonder what to look for inside the trace? "send", I suppose:

Code:
[pid 22137] sendto(5, "M-SEARCH * HTTP/1.1\r\nHost: 239.2"..., 109, 0, {sa_family=AF_INET, sin_port=htons(1900), sin_addr=inet_addr("239.255.255.250")}, 16) = 109
[pid 22137] sendto(9, "M-SEARCH * HTTP/1.1\r\nHost: 239.2"..., 109, 0, {sa_family=AF_INET, sin_port=htons(1900), sin_addr=inet_addr("239.255.255.250")}, 16) = 109
[pid 22137] sendto(5, "M-SEARCH * HTTP/1.1\r\nHost: 239.2"..., 115, 0, {sa_family=AF_INET, sin_port=htons(1900), sin_addr=inet_addr("239.255.255.250")}, 16) = 115
[pid 22137] sendto(9, "M-SEARCH * HTTP/1.1\r\nHost: 239.2"..., 115, 0, {sa_family=AF_INET, sin_port=htons(1900), sin_addr=inet_addr("239.255.255.250")}, 16) = 115
[pid 22137] sendto(5, "M-SEARCH * HTTP/1.1\r\nHost: 239.2"..., 109, 0, {sa_family=AF_INET, sin_port=htons(1900), sin_addr=inet_addr("239.255.255.250")}, 16) = 109
[pid 22137] sendto(9, "M-SEARCH * HTTP/1.1\r\nHost: 239.2"..., 109, 0, {sa_family=AF_INET, sin_port=htons(1900), sin_addr=inet_addr("239.255.255.250")}, 16) = 109
[pid 22140] sendto(10, "?", 1, 0, {sa_family=AF_INET, sin_port=htons(8300), sin_addr=inet_addr("255.255.255.255")}, 16) = 1
[pid 22140] sendto(10, "?", 1, 0, {sa_family=AF_INET, sin_port=htons(8300), sin_addr=inet_addr("127.255.255.255")}, 16) = 1
[pid 22140] sendto(10, "?", 1, 0, {sa_family=AF_INET, sin_port=htons(8300), sin_addr=inet_addr("127.0.255.255")}, 16) = 1
[pid 22140] sendto(10, "?", 1, 0, {sa_family=AF_INET, sin_port=htons(8300), sin_addr=inet_addr("127.0.1.255")}, 16) = 1
[pid 22145] sendto(5, "?", 1, 0, {sa_family=AF_INET, sin_port=htons(8300), sin_addr=inet_addr("255.255.255.255")}, 16 <unfinished ...>
[pid 22144] sendto(9, "M-SEARCH * HTTP/1.1\r\nHost: 239.2"..., 109, 0, {sa_family=AF_INET, sin_port=htons(1900), sin_addr=inet_addr("239.255.255.250")}, 16) = 109
[pid 22144] sendto(10, "M-SEARCH * HTTP/1.1\r\nHost: 239.2"..., 109, 0, {sa_family=AF_INET, sin_port=htons(1900), sin_addr=inet_addr("239.255.255.250")}, 16) = 109
[pid 22144] sendto(9, "M-SEARCH * HTTP/1.1\r\nHost: 239.2"..., 115, 0, {sa_family=AF_INET, sin_port=htons(1900), sin_addr=inet_addr("239.255.255.250")}, 16) = 115
[pid 22144] sendto(10, "M-SEARCH * HTTP/1.1\r\nHost: 239.2"..., 115, 0, {sa_family=AF_INET, sin_port=htons(1900), sin_addr=inet_addr("239.255.255.250")}, 16) = 115
[pid 22144] sendto(9, "M-SEARCH * HTTP/1.1\r\nHost: 239.2"..., 109, 0, {sa_family=AF_INET, sin_port=htons(1900), sin_addr=inet_addr("239.255.255.250")}, 16) = 109
[pid 22144] sendto(10, "M-SEARCH * HTTP/1.1\r\nHost: 239.2"..., 109, 0, {sa_family=AF_INET, sin_port=htons(1900), sin_addr=inet_addr("239.255.255.250")}, 16) = 109
[pid 22145] <... sendto resumed> )      = 1
[pid 22145] sendto(5, "?", 1, 0, {sa_family=AF_INET, sin_port=htons(8300), sin_addr=inet_addr("127.255.255.255")}, 16 <unfinished ...>
[pid 22145] <... sendto resumed> )      = 1
[pid 22145] sendto(5, "?", 1, 0, {sa_family=AF_INET, sin_port=htons(8300), sin_addr=inet_addr("127.0.255.255")}, 16) = 1
[pid 22145] sendto(5, "?", 1, 0, {sa_family=AF_INET, sin_port=htons(8300), sin_addr=inet_addr("127.0.1.255")}, 16) = 1


Mmm.. well, the references to port 8300 are for the regular empeg discovery method. But for some reason it's not using a valid broadcast IP address for them. Hmmph.
Code:
eth0      Link encap:Ethernet  HWaddr 00:11:43:7A:5A:B9
          inet addr:10.0.0.14  Bcast:10.0.0.127  Mask:255.255.255.128
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1860566 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1570532 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1199584566 (1.1 GiB)  TX bytes:470436122 (448.6 MiB)
          Interrupt:19