RE: How can I send packets to 255.255.255.255 from the command line?
> -Original Message- > From: owner-freebsd-...@freebsd.org [mailto:owner-freebsd- > n...@freebsd.org] On Behalf Of Ryan Stone > Sent: Donnerstag, 18. August 2016 21:30 > To: freebsd-net > Subject: How can I send packets to 255.255.255.255 from the command line? > > I want to test a change to broadcast packet handling and I want to confirm > that 255.255.255.255 is still handled correctly. Are there any command-line > tools in FreeBSD that can send to the broadcast address? ping > 255.255.255.255 does not work correctly, unfortunately. > ___ > freebsd-net@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org" Hello, this is a long-standing bug in the FreeBSD network implementation. The situation has not changed since the examination done in comment 10 of this problem report: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=99558 In order to be able to send packets to the 255.255.255.255 IP address you need to change the kernel sources. I have developed a patch (actually two of them) that allows to work around the problem. The first approach looks for the first network interface that is configured for broadcasting and sends the broadcast to its network broadcast address. This should be in conformance to the RFCs that leave it to the implementation whether to do the broadcast on an arbitraty network interface or on all of them. In my second attempt to tackle the problem I am looking in addition at the source address of the IP packet and try to find a network interface that is in the same local network as the source IP address. The code changes in the second approach are probably a bit more hackish and might need some further testing. If you are interested I can provide you with the changes. They are based on 10-stable or 11-stable as of not to long ago. As the to-be-patched sources do not change a lot the patches should be applicable with no problems. Of course I (or rather my company) would like to see the bug fixed in the FreeBSD sources and would be sympathetic to a review of the patches in the hope to include them in the official sources. Regards, Wolfgang Follow HOB: - HOB: http://www.hob.de/redirect/hob.html - Xing: http://www.hob.de/redirect/xing.html - LinkedIn: http://www.hob.de/redirect/linkedin.html - HOBLink Mobile: http://www.hob.de/redirect/hoblinkmobile.html - Facebook: http://www.hob.de/redirect/facebook.html - Twitter: http://www.hob.de/redirect/twitter.html - YouTube: http://www.hob.de/redirect/youtube.html - E-Mail: http://www.hob.de/redirect/mail.html HOB GmbH & Co. KG Schwadermuehlstr. 3 D-90556 Cadolzburg Geschaeftsfuehrung: Klaus Brandstaetter, Zoran Adamovic AG Fuerth, HRA 5180 Steuer-Nr. 218/163/00107 USt-ID-Nr. DE 132747002 Komplementaerin HOB electronic Beteiligungs GmbH AG Fuerth, HRB 3416 ___ freebsd-net@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
Re: How can I send packets to 255.255.255.255 from the command line?
It is still limited to the "local network," about as harmless as a DHCP broadcast. - Charles Sent from my iPhone > On Aug 19, 2016, at 11:15 AM, Valeri Galtsev > wrote: > > >> On Fri, August 19, 2016 9:46 am, Andrey V. Elsukov wrote: >>> On 18.08.16 22:29, Ryan Stone wrote: >>> I want to test a change to broadcast packet handling and I want to >>> confirm >>> that 255.255.255.255 is still handled correctly. Are there any >>> command-line >>> tools in FreeBSD that can send to the broadcast address? ping >>> 255.255.255.255 does not work correctly, unfortunately. >> >> There is one in src/tools/regression/netinet/ipbroadcast >> You can build it with command >> # make WARNS=0 >> > > Am I the only one who is kind of kicked out of the chair when seeing > someone attempting to broadcast the who ipv4 internet: 255.255.255.255 ?! > Someone explain me this is OK and is not a "big bang" level of noise ;-( > > Valeri > >> -- >> WBR, Andrey V. Elsukov >> >> > > > > Valeri Galtsev > Sr System Administrator > Department of Astronomy and Astrophysics > Kavli Institute for Cosmological Physics > University of Chicago > Phone: 773-702-4247 > > ___ > freebsd-net@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org" ___ freebsd-net@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
Re: How can I send packets to 255.255.255.255 from the command line?
On Fri, August 19, 2016 9:46 am, Andrey V. Elsukov wrote: > On 18.08.16 22:29, Ryan Stone wrote: >> I want to test a change to broadcast packet handling and I want to >> confirm >> that 255.255.255.255 is still handled correctly. Are there any >> command-line >> tools in FreeBSD that can send to the broadcast address? ping >> 255.255.255.255 does not work correctly, unfortunately. > > There is one in src/tools/regression/netinet/ipbroadcast > You can build it with command > # make WARNS=0 > Am I the only one who is kind of kicked out of the chair when seeing someone attempting to broadcast the who ipv4 internet: 255.255.255.255 ?! Someone explain me this is OK and is not a "big bang" level of noise ;-( Valeri > -- > WBR, Andrey V. Elsukov > > Valeri Galtsev Sr System Administrator Department of Astronomy and Astrophysics Kavli Institute for Cosmological Physics University of Chicago Phone: 773-702-4247 ___ freebsd-net@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
Re: How can I send packets to 255.255.255.255 from the command line?
On 18.08.16 22:29, Ryan Stone wrote: > I want to test a change to broadcast packet handling and I want to confirm > that 255.255.255.255 is still handled correctly. Are there any command-line > tools in FreeBSD that can send to the broadcast address? ping > 255.255.255.255 does not work correctly, unfortunately. There is one in src/tools/regression/netinet/ipbroadcast You can build it with command # make WARNS=0 -- WBR, Andrey V. Elsukov signature.asc Description: OpenPGP digital signature
Re: How can I send packets to 255.255.255.255 from the command line?
Hello! Is netcat [nc(1)] an option? It doesn't seem to have any objections to doing this, but I don't have a setup to test it properly with at the moment. Thanks, Kyle Evans On Thu, Aug 18, 2016 at 2:29 PM, Ryan Stone wrote: > I want to test a change to broadcast packet handling and I want to confirm > that 255.255.255.255 is still handled correctly. Are there any command-line > tools in FreeBSD that can send to the broadcast address? ping > 255.255.255.255 does not work correctly, unfortunately. > ___ > freebsd-net@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org" ___ freebsd-net@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
Re: How can I send packets to 255.255.255.255 from the command line?
On 18/08/2016 21:55, Ryan Stone wrote: On Thu, Aug 18, 2016 at 4:48 PM, Paul A. Procacci wrote: You should be able to ping the local subnet. Alternatively you can use net/arping. ~Paul I'm specifically looking to test the handling of 255.255.255.255, so a local broadcast address is out. Unfortunately, arping doesn't seem to do the right thing on FreeBSD. It manages to get the kernel to try arp'ing for 255.255.255.255. This very likely comes under the heading of "horrible bodges" but when I needed to do this, after much experimenting I added a static route to 255.255.255.0/24 pointing to the local LAN broadcast address. For example, on a machine with address 192.168.10.10/24 the "fix" would be: route add 255.255.255.0/24 192.168.10.255 My code could then happily send UDP to 255.255.255.255 without issue, and the packets make it out onto the wire with a broadcast destination MAC address. This was under 10.1-RELEASE; things may have changed that make it no longer work. I did warn you that it came under the heading of "horrible bodges" :) Paul. ___ freebsd-net@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
Re: How can I send packets to 255.255.255.255 from the command line?
On Thu, Aug 18, 2016 at 4:48 PM, Paul A. Procacci wrote: > You should be able to ping the local subnet. > Alternatively you can use net/arping. > > ~Paul > I'm specifically looking to test the handling of 255.255.255.255, so a local broadcast address is out. Unfortunately, arping doesn't seem to do the right thing on FreeBSD. It manages to get the kernel to try arp'ing for 255.255.255.255. ___ freebsd-net@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
How can I send packets to 255.255.255.255 from the command line?
I want to test a change to broadcast packet handling and I want to confirm that 255.255.255.255 is still handled correctly. Are there any command-line tools in FreeBSD that can send to the broadcast address? ping 255.255.255.255 does not work correctly, unfortunately. ___ freebsd-net@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
