As I understand it, public IPv6 addresses allocated by the IANA will have the prefix 2000::/3. These ip addresses will be routable through the Internet. IPv6 multicast addresses on the other side are prefixed FF00::/8. So my understanding is that the ipv6 multicast addresses won’t be routable through the internet. I am right? If so, is there any way to do one-to-many ip routing over the Internet in IPv6? Thanks! Asked by Absolom So will [...]

We have a LAN with 2x Cisco 4500′s as gateways running HSRP. We’re using Exterity HD IP Encoders to take HD video and put it onto the network as a multicast UDP stream (playable in VLC). I have a fairely extensive Nagios setup on Linux and would like to find some way to check that: Multicast stream is on the network. Multicast stream isn’t frozen, so check for audio or … Confirm the source IP [...]

My Server and Client softwares run both on Linux. The Server broadcasts multicast, the Client listens multicast. My Client has to migrate to another site, and unfortunately multicast is not allowed between the two sites How to convey multicast between the two sites? – Through TCP or UDP? – What tools do you recommend? – What about latency? I received an good answer about Cisco configuration (GRE), but one of the network teams do not [...]

Could somebody explain what exactly this command means in relation to transmitting and receiving multicast traffic route add -net 224.0.0.0 netmask 240.0.0.0 eth0 Asked by smicjk The “224.0.0.0″ is a reserved range of IPv4 addresses having special multicast meaning (IPv4 Multicast). The command in itself just means that the multicast routing should go through the “eth0″ interface. Answered by Ouki Check more discussion of this question. Bookmark on Delicious Digg this post Recommend on Facebook [...]

I have a FreeBSD 9 router (a Soekris net6501) connected to the internet via a dsl modem (bridged), doing NAT for two internal subnets, 10.0.1.0/24 (LAN) and 10.0.2.0/24 (wifi net). There are routes between the subnets and things like ssh host-A.wifi from host-B.lan works. But, wireless clients (like iPads and iPhones) on the 10.0.2.0/24 net can’t seem to find stuff on the LAN (for example, airplay to an Apple-TV on the LAN). I’m not totally [...]

I’m trying to pass mulitcast stream from interface eth1 (192.168.20.41) to interface tun0 (192.168.100.40) on CentOS 5. I can see incoming multicast stream on eth1: tcpdump -n -i eth1 type=1700 audit(1324681169.542:52): dev=eth1 prom=256 old_prom=0 auid=4294967295 ses=4294967295 Dec 23 17:59:29 localhost kernel: device eth1 entered promiscuous mode Dec 23 17:59:29 localhost kernel: type=1700 audit(1324681169.542:52): dev=eth1 prom=256 old_prom=0 auid=4294967295 ses=4294967295 tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on eth1, link-type EN10MB [...]

I have secured a linux box, starting with iptables -P INPUT DROP iptables -P OUTPUT DROP iptables -P FORWARD DROP and after adding rules to enable specific protocols and streams. Which are the correct rules to add multicast support ? I am trying with these – for both client and server multicast : iptables -A INPUT -m pkttype –pkt-type multicast -j ACCEPT iptables -A OUTPUT -m pkttype –pkt-type multicast -j ACCEPT iptables -A INPUT –protocol [...]

I have linux computer , this computer connected with entire my network via zyxel gs-2200. In this zyxel also connected router with 500 vlans, one by client. On linux computer i have vlc program that stream multicast ip-tv. In the same vlan where is my linux box, i can see the tv. Question is, how to reshare this multicast stream to all vlans? Who (zyxel, router (freebsd) , or linux box) and how must modify [...]

I need a virtualization solution with the following properties: guest OSes can receive multicast traffic from the host machine. some services running on the guest OS (eg: port 80) can be port forwarded, so it’s visible on the host and other machines. I tried vmware player, it doesn’t support multicast at all. I managed to set up port forwarding with Virtualbox, but multicast doesn’t work seem to work. If you can’t use bridging mode for [...]

I work on a product that consists of a number of headless Linux boxes that work together as a cluster. These boxes synchronize their state with each other by sending proprietary-format link-local IPv6 multicast packets (to ff12::xxxx%en0). These packets can take up a non-trivial amount of bandwidth when the system state is changing quickly, but that’s okay because the Linux boxes are running over a Gigabit Ethernet LAN and there is plenty of bandwidth to [...]