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5
votes
2answers
4k views

How managed switches handle Broadcast Multicast and Unicast?

Under typical scenarios, a network switch needs to handle broadcast, multicast and unicast messages at the same time. I'd like to understand On a typical managed switch (1Gb Ethernet/10Gb Ethernet), ...
2
votes
2answers
526 views

Stop unwanted network traffic on second nic

I work for a company who make a networking product. The device we create is attached to the testing PC via a second NIC and is on a seperate subnet to the primary nic on the corporate lan. We are ...
3
votes
1answer
447 views

one particular laptop does not receive UDP broadcast messages

I am trying to debug a problem with a particular laptop which is running Ubuntu. We have a service which uses broadcast UDP messages, and this laptop is not receiving them on its wireless interface, ...
1
vote
1answer
707 views

Passing Wake On LAN traffic across subnets with Dell PowerConnect 62xx

I am working on an SCCM project that requires powering on computers in the middle of the night to run updates. SCCM can send the WoL packets, but I am struggling to figure out how to pass this across ...
2
votes
2answers
88 views

Need confirmation on layer 2 security question

I need confirmation on a question regarding layer 2 security. I've been doing research and I just need to know that I understand it correctly. Basically, if you have a LAN with a few machines ...
-1
votes
4answers
2k views

How can I “kill” a computer network services on my lan?

I'm in a strange situation... A customer has a huge network based on static ip. All machine names are not useful to identify a computer location and network switches are not managed. One of the ...
2
votes
2answers
2k views

what should be the destination MAC address for a limited broadcast address(255.255.255.255)

configuration: host(H1-10.10.10.55/24) has a default gateway(g1) 10.10.10.1/24. Question 1:H1 sends a packet to 255.255.255.255. What should be the destination MAC address in the outgoing frame? ...
0
votes
2answers
1k views

How to route broadcast packets from machine with two network interfaces on same subnet

I run RHEL 5 and have two NICs on one machine connected to the same subnet: eth0 192.168.100.10 eth1 192.168.100.11 My application needs to receive and transmit UDP packets (both unicast ...
25
votes
4answers
3k views

Why can't IPv6 send broadcasts?

IPv4 can broadcast. Why can't IPv6 do that?
2
votes
2answers
455 views

Rebroadcasting videostream from IP-camera

The problem is the following: I have a camera D-Link securicam dcs-2121 (http://www.dlink.com.sg/products/?idproduct=310) it has its own web-server and works perfectly with a few connected users, but ...
1
vote
1answer
1k views

Iptables - Allowing only a single dhcp (relay) client

I am trying to create a firewall rule on an Ubuntu 10.04 server running isc-dhcpd. I only want dhcp to be accessible by a single relay host (172.1.1.1). I have iptables set up like so: # iptables ...
1
vote
2answers
260 views

Microsoft Networking - WINS, DHCP, considerations for moving from a flat to routed network

We are moving our network from a flat 192.168.x.x/16 to a routed network to be composed of several /24 subnets and a layer 3 switch. It is a Windows network, active directory integrated, standard ...
3
votes
5answers
1k views

HP switches sending multi-cast ping requests

I'm not our normal network guy... I've just been drafted to help with this issue, so please bear with me. We have a fairly large (~4,000 devices?) network mostly comprised of HP Procurve gear. From ...
0
votes
1answer
357 views

Getting apache to respond to http broadcasts

I was wondering if there is a way to configure Apache to respond to http requests sent to the broadcast address (ie. 192.168.1.255). Thanks
1
vote
3answers
3k views

RV042 - how to broadcast UDP through VPN

I setup a gateway to gateway vpn connection with linksys RV042 router. i was able to ping each other, access file sharing ( with netbios enabled ). They are having same subnet mask 255.255.255.0, ...
3
votes
2answers
6k views

Bonjour/mDNS Broadcast across subnets

I have just setup a new OSX Server in our office and verified that everything is working fine over our wired network (192.168.126.0/24). The problem that I am having is that our clients (Mac Laptops) ...
2
votes
2answers
2k views

Broadcast UDP over VPN

I have OpenVPN configured and have 5 dd-wrt router clients. I would like the machines on those routers to be-able to UDP Broadcast across all 5 networks. I cannot bridge the interfaces(to my ...
0
votes
1answer
276 views

Local Live Quicktime Video Broadcast, latency?

I'm looking into the feasibility of using a local server to distribute live video of a conference to delegates in the same room. They would still hear the live audio coming from the speaker, so only ...
2
votes
1answer
4k views

broadcast ping on windows LAN [closed]

I have a LAN of windows machine some running XP some running 2000, my broadcast ping times out all the time. is it due to firewall? or some other setting in registry?
0
votes
4answers
128 views

How is frequency multiplexing implemented?

How is frequency multiplexing implemented? I understand that in time division multiplexing the feed of each channel just uses its own time interval for sending out data over the same medium. But how ...
1
vote
1answer
279 views

Broadcast message

I had a ssh connection to a remote server and just got a message Broadcast message from foo@foo (/dev/tty2) at 19:17 ... The system is going down for reboot NOW! Connection to foo closed by remote ...
8
votes
2answers
12k views

How to alter the global broadcast address (255.255.255.255) behavior on Windows?

Desired behavior When an application sends a packet to the global broadcast IP address 255.255.255.255, I would like that the packet be sent to the Ethernet global broadcast address ...
1
vote
2answers
2k views

Cisco 1242 WAP Configuration to broadcast SSIDs

OK, one would think this would be an easy question to answer. But searching online yields no results to our particular issue. We have Cisco WAPs that require configuration to broadcast the SSID of our ...
3
votes
4answers
734 views

What happens if I ask 127.0.0.1 via arp broadcasting?

Will all the computers on the network will answer me?
1
vote
2answers
1k views

Unicast video streaming on FreeBSD

I need to broadcast one live video stream from Windows machine (captured by TV tuner) to many viewers in the Internet. Because bandwidth is limited on this machine it should be forwarded to FreeBSD ...
2
votes
4answers
1k views

What is responsible of setting up the default broadcast address?

The broadcast address is apparently misconfigured on some (old) Linux embedded device that I setup (but that I don't own anymore) because it doesn't match the expected value given the IP address and ...