Red Hat Bugzilla – Bug 406931
Fedora-8 sendto(INADDR_BROADCAST) won't udp broadcast, with test code.
Last modified: 2013-01-22 20:43:32 EST
Description of problem:
Unable to broadcast short udp datagrams on Fedora 8 using INADDR_BROADCAST or
any other netmask.
Version-Release number of selected component (if applicable):
Compile and execute included test Client and Server on Fedora-8, compare
with behavior on RHEL-5.
Steps to Reproduce:
1. extract BroadcastBug.tgz, select a NETMASK in ClientServer.hh, make
2. Execute Client (which loops for 2 minutes), then Server (yeah, it looks
backwards). Client should respond if it receives broadcast message.
3. Try RHEL 4 or 5 first to see expected result, then repeat on Fedora-8.
RHEL 4 and 5 (cleverly disguised as CentOS) work as expected, multiple Clients
recieve messages broadcast from Server. I am unable to make Fedora-8 broadcast
at all; no broadcast messages are received. (I'm surprised to see this, but if
there's a configuration problem on my Fedora-8 box I haven't found it.)
I think udp datagram broadcasts should behave the same on all platforms.
Created attachment 274291 [details]
gzipped tarfile of BroadcastBug directory, with C source, Makefile, and README
sendto etc. are just simple wrappers around kernel syscalls, so this has nothing
to do with glibc.
Did you test:
RHEL client and F8 server
RHEL server and F8 client
Also, run wireshark/tcpdump on both client and server and look at what gets sent
Sorry, can't help with that at present. I've but one machine at home, and one at
the office, where I've unable to install Fedora-8 as a Xen guest. I'll let you
know when I can do more. Thanks!
In reply to comment #3)
> Did you test:
> RHEL client and F8 server
> RHEL server and F8 client
> Also, run wireshark/tcpdump on both client and server and look at what gets sent
> and received.
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