This also works for me on RedHat 7.3 Linux. Here is the relevant portion of the strace output; perhaps it will be useful to compare against on whatever you're running on: 
socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP) = 4
fcntl64(4, F_GETFL)                     = 0x2 (flags O_RDWR)
fstat64(4, {st_mode=S_IFSOCK|0777, st_size=0, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
+ 0) = 0x40112000
_llseek(4, 0, 0xbfffe900, SEEK_CUR)     = -1 ESPIPE (Illegal seek)
fcntl64(4, F_GETFL)                     = 0x2 (flags O_RDWR)
fstat64(4, {st_mode=S_IFSOCK|0777, st_size=0, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
+ 0) = 0x40113000
_llseek(4, 0, 0xbfffe900, SEEK_CUR)     = -1 ESPIPE (Illegal seek)
fcntl64(4, F_SETFD, FD_CLOEXEC)         = 0
brk(0x818e000)                          = 0x818e000
setsockopt(4, SOL_SOCKET, SO_BROADCAST, [1], 4) = 0
bind(4, {sin_family=AF_INET, sin_port=htons(67), sin_addr=inet_addr("0
+.0.0.0")}}, 16) = 0
recvfrom(4, "\1\1\6\0ZeH\n\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0".
+.., 1024, 0, {sin_family=AF_INET, sin_port=htons(68), sin_addr=inet_a
+ddr("0.0.0.0")}}, [16]) = 300
fstat64(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 4), ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
+ 0) = 0x40114000
write(1, "Saw a bootp request.\n", 21)  = 21

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In reply to Re: Intercepting UDP broadcasts by sfink
in thread Intercepting UDP broadcasts by Abigail-II

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