This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. ------_=_NextPart_001_01C2C7BD.C3B6D200 Content-Type: text/plain; charset="iso-8859-1" Hi, I have been reading: http://lartc.org/howto/lartc.multicast.html in effort to understand how to route multicast traffic and just joined the group. History: I am trying to multicast mpeg (using the videolan server) on a private network. The server side of the network is copper gigabit, which connects to one of those cheap fast Ethernet switches with a single gigabit uplink. The problem I'm having is the ports are getting flooded on the client side switch (i.e., all multicast traffic sent to all ports on the switch). After doing some research it sounds like installing a multicast router between the client and server side is the best solution. So that's what I'm trying to do now. I have Red hat Linux 7.3 installed. I've gone through the steps described on the how-to (link above): $ demsg | grep IGMP IP Protocols: ICMP, UDP, TCP, IGMP $ cat /proc/sys/net/ipv4/ip_forward 1 $ netstat -rn Kernel IP routing table Destination Gateway Genmask Flags MSS Window irtt Iface 192.168.3.0 0.0.0.0 255.255.255.0 U 40 0 0 eth1 10.100.100.0 0.0.0.0 255.255.255.0 U 40 0 0 eth0 127.0.0.0 0.0.0.0 255.0.0.0 U 40 0 0 lo 224.0.0.0 0.0.0.0 240.0.0.0 U 40 0 0 eth1 0.0.0.0 10.100.100.254 0.0.0.0 UG 40 0 0 eth0 # NOTE: eth1 is the client side, eth0 is the server side. Problem: The problem is that no multicast is getting through the router (unicast traffic works fine). When I run: $ tcpdump -n -i eth0 I see all of the multicast traffic being sent. Unfortunately: $ tcpdump -n -i eth1 shows none of that multicast traffic (whether the client has requested it or not). Interestingly, when I run iptraf and select eth0 it reports little to no activity, which indicates to me that the traffic is getting dropped at a low level. Question: My question at this point is problem identification. Is the router configured correctly and acting as expected but the client just isn't sending the IGMP join requests? Do I need to install additional software packages like Zebra or mrouted to make this work? Am I completely missing something? Any help or suggestions are greatly appreciated! regards, -bob -bob CONFIDENTIALITY NOTICE: The information in this electronic mail transmission contains confidential information intended only for the use of the individual or entity named above. If the reader of this message is not the intended recipient, you are hereby notified that any dissemination, distribution or copy of the transmission is strictly prohibited. ------_=_NextPart_001_01C2C7BD.C3B6D200 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"> <HTML> <HEAD> <META HTTP-EQUIV=3D"Content-Type" CONTENT=3D"text/html; = charset=3Diso-8859-1"> <META NAME=3D"Generator" CONTENT=3D"MS Exchange Server version = 5.5.2653.12"> <TITLE>building a multicast router</TITLE> </HEAD> <BODY> <P><FONT SIZE=3D2>Hi,</FONT> </P> <P><FONT SIZE=3D2>I have been reading: <A = HREF=3D"http://lartc.org/howto/lartc.multicast.html"; = TARGET=3D"_blank">http://lartc.org/howto/lartc.multicast.html</A> in = effort to understand how to route multicast traffic and just joined the = group.</FONT></P> <P><FONT SIZE=3D2>History: I am trying to multicast mpeg (using the = videolan server) on a private network. The server side of = the network is copper gigabit, which connects to one of those cheap = fast Ethernet switches with a single gigabit uplink. The = problem I'm having is the ports are getting flooded on the client side = switch (i.e., all multicast traffic sent to all ports on the = switch).</FONT></P> <P><FONT SIZE=3D2>After doing some research it sounds like installing a = multicast router between the client and server side is the best = solution. So that's what I'm trying to do now.</FONT></P> <P><FONT SIZE=3D2>I have Red hat Linux 7.3 installed. I've gone through = the steps described on the how-to (link above):</FONT> </P> <P><FONT SIZE=3D2>$ demsg | grep IGMP </FONT> <BR><FONT SIZE=3D2>IP Protocols: ICMP, UDP, TCP, IGMP</FONT> <BR><FONT SIZE=3D2>$ cat /proc/sys/net/ipv4/ip_forward</FONT> <BR><FONT SIZE=3D2>1</FONT> <BR><FONT SIZE=3D2>$ netstat -rn</FONT> <BR><FONT SIZE=3D2>Kernel IP routing table</FONT> <BR><FONT SIZE=3D2>Destination = Gateway = Genmask = Flags MSS Window irtt Iface</FONT> <BR><FONT SIZE=3D2>192.168.3.0 = 0.0.0.0 = 255.255.255.0 U = 40 0 0 = eth1</FONT> <BR><FONT SIZE=3D2>10.100.100.0 = 0.0.0.0 = 255.255.255.0 U = 40 0 0 = eth0</FONT> <BR><FONT SIZE=3D2>127.0.0.0 = 0.0.0.0 = 255.0.0.0 = U 40 = 0 0 lo</FONT> <BR><FONT SIZE=3D2>224.0.0.0 = 0.0.0.0 = 240.0.0.0 = U 40 = 0 0 eth1</FONT> <BR><FONT = SIZE=3D2>0.0.0.0 = 10.100.100.254 = 0.0.0.0 = UG 40 = 0 0 eth0</FONT> </P> <P><FONT SIZE=3D2># NOTE: eth1 is the client side, eth0 is the server = side.</FONT> </P> <P><FONT SIZE=3D2>Problem:</FONT> <BR><FONT SIZE=3D2>The problem is that no multicast is getting through = the router (unicast traffic works fine). When I run:</FONT> </P> <P><FONT SIZE=3D2>$ tcpdump -n -i eth0</FONT> </P> <P><FONT SIZE=3D2>I see all of the multicast traffic being sent. = Unfortunately:</FONT> </P> <P><FONT SIZE=3D2>$ tcpdump -n -i eth1</FONT> </P> <P><FONT SIZE=3D2>shows none of that multicast traffic (whether the = client has requested it or not). Interestingly, when I run iptraf and = select eth0 it reports little to no activity, which indicates to me = that the traffic is getting dropped at a low level.</FONT></P> <P><FONT SIZE=3D2>Question:</FONT> <BR><FONT SIZE=3D2>My question at this point is problem = identification. Is the router configured correctly and acting as = expected but the client just isn't sending the IGMP join = requests? Do I need to install additional software packages like = Zebra or mrouted to make this work? Am I completely missing = something? </FONT></P> <P><FONT SIZE=3D2>Any help or suggestions are greatly = appreciated!</FONT> </P> <P><FONT SIZE=3D2>regards,</FONT> </P> <P><FONT SIZE=3D2>-bob</FONT> </P> <BR> <BR> <P><FONT SIZE=3D2>-bob</FONT> </P> <BR> <BR> <P><FONT SIZE=3D2>CONFIDENTIALITY NOTICE: The information in this = electronic mail transmission contains confidential information intended = only for the use of the individual or entity named above. If the = reader of this message is not the intended recipient, you are hereby = notified that any dissemination, distribution or copy of the = transmission is strictly prohibited.</FONT></P> </BODY> </HTML> ------_=_NextPart_001_01C2C7BD.C3B6D200--
