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25
votes
4answers
3k views

Why can't IPv6 send broadcasts?

IPv4 can broadcast. Why can't IPv6 do that?
8
votes
2answers
11k 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 ...
7
votes
1answer
690 views

Can a limited broadcast packet contain destination MAC address other than FF:FF:FF:FF:FF:FF?

Can a limited broadcast contain destination MAC address other than FF:FF:FF:FF:FF:FF? If the answer is true, could you provide an example of a protocol that uses a packet like this. Ok, to elaborate ...
5
votes
2answers
3k 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), ...
5
votes
1answer
550 views

Network bridge and broadcast ethernet frames

Let R1 and R2 be two (wireless) routers. Both R1 and R2 have one wired interface eth0 and one wireless interface wlan0. On each router, both interfaces are bridged on br0. So: R1.br0 = R1.eth0 + ...
4
votes
1answer
161 views

How does an Access Point handle broadcast packets from the wired side?

I have an Cisco AP 1242AG autonomous AP connected to L2 switches. Let's say I have 100 wired devices each sending 2 broadcast UDP packets per second. Obviously these packets will reach the Access ...
4
votes
1answer
253 views

How does broadcasting work on a server with multiple IPs?

Say you have two dhcp servers, A and B. Server A has two IP addresses, 10.0.0.1 and 10.0.0.2. Server B has one IP address, 10.0.0.3. Server A has two instances of isc-dhcp running, one specifying a ...
3
votes
4answers
720 views

What happens if I ask 127.0.0.1 via arp broadcasting?

Will all the computers on the network will answer me?
3
votes
2answers
524 views

What is this in my syslog and should I be concerned?

I'm seeing a lot of the following line in /var/log/syslog: Jun 21 14:36:15 my-server kernel: [416219.080061] iptables denied: IN=eth0 OUT= MAC=ff:ff:ff:ff:ff:ff:the-mac-address:08:00 SRC=0.0.0.0 ...
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 ...
3
votes
2answers
5k 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) ...
3
votes
1answer
209 views

Is it necessary to manually set the interface broadcast address?

I'm converting my scripts from old net-tools: ifconfig eth0 192.168.2.1 netmask 255.255.255.0 to iproute2: ip link set eth0 up ip addr add 192.168.2.1/24 dev eth0 and I notice that the new ...
3
votes
2answers
983 views

Many clients on a wireless AP for UDP broadcast packets

I asked this question on StackOverflow and was directed over here, so I'd appreciate any advice. I'm deploying a smartphone application as part of a live music performance that depends on receiving ...
3
votes
1answer
431 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, ...
2
votes
3answers
866 views

How is DHCP request message broadcasted?

The broadcast address of DHCP request message is 255.255.255.255. Will this request message go through routers? It seems to be yes as the destination address is 255.255.255.255. However, it does not ...
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?
2
votes
1answer
1k views

Forward broadcast to fixed IP using IPTables

I need to forward (route) broadcast packets from several wireless clients to a single server in the fixed network. The wireless and fixed network are not bridged for security reasons. With the ...
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 ...
2
votes
2answers
2k views

Can I test broadcast packets on a single machine?

I want to have a server sending broadcast UDP packets and two other clients, in the same machine, receiving them. Can I do that somehow? What IP address would I use? @gravyface gave me hope but I ...
2
votes
2answers
495 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 ...
2
votes
2answers
87 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 ...
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? ...
2
votes
2answers
450 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 ...
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 ...
2
votes
0answers
21 views

How do I prevent directed broadcast packets in Hyper-V using virtual network adapter

When I connect two physical subnets by using a Cisco Router, I can configure the router to disable directed broadcasts (that could be used for example to send Magic packets for waking up Computers ...
2
votes
0answers
83 views

Is there a way to catch system broadcast messages

Is there a way to catch system broadcast messages (like those which are send to all tty users to inform of a shutdown) and send them via e-mail to a user?
2
votes
2answers
957 views

VmwareESXi Vlans, Cisco devices and broadcast making the things odd

I'm having problem for some days trying to make a correct configuration Right now I have a Cisco Catalyst switch, a Cisco Router 2811 and a VMware ESXi node with 4-8 VM (Linux,BSD, Windows), each ...
2
votes
1answer
308 views

When should NTPd broadcast/broadcastclient be used instead of client/server or peer modes?

The NTP deamon if often used in its simplest mode, which is client/server: you specify one or more server directives in your ntp.conf and your clients will use those servers. In addition to that, ...
1
vote
2answers
257 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 ...
1
vote
1answer
268 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 ...
1
vote
1answer
750 views

How do I add a broadcast IP to the loopback interface under os/x using ifconfig when my machine has no network? [duplicate]

I'm new to advanced network administration and I would like to do some testing with UDP broadcasting, so I need a broadcast address on my loopback interface. The machine is offline, in other words, ...
1
vote
4answers
109 views

Just one client bound to address and port: does it make a difference broadcast versus unicast in terms of overhead?

Scenario: I am implementing failed over for a network node, so my idea is to make the master node listens on a broadcast ip address and port. If the master node fails, another failover node will ...
1
vote
2answers
247 views

DHCP and the use of link-layer broadcast

I have some doubts I can't clarify in the manual (Kurose or Tanenbaum) DHCP use a link-layer broadcast. If we are using DHCP and to receive a response, the node should be in the same link as the DHCP ...
1
vote
2answers
2k views

VLAN support on Juniper EX - 2200 switches

I have 6 Juniper switches (EX - 2200) connected to each other as shown in the network topology. ![enter image description here][1] I have two PC's that I am using PC1 - (used for configuring the 6 ...
1
vote
2answers
1k 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 ...
1
vote
3answers
2k views

iptables: match only untagged traffic on an interface with VLANs

As far as i know, there is no way of distinguishing VLAN traffic in iptables on the master interface (that is the interface to which virtual VLAN interfaces are added with vconfig or ip link add link; ...
1
vote
1answer
487 views

Setting ip helper-address to a broadcast address, bad idea?

Info: A number of vlans running on a 16 bit subnet All DHCP servers are on the same subnet (10.1.0.0/16) All switches and routers are Cisco If I was to set the ip helper-address in our ...
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 ...
1
vote
1answer
162 views

Does Azure support UDP Broadcast?

I am aware that Azure supports UDP, but does it support UDP broadcast? I am wanting to use the Jenkins Swarm plugin, which requires UDP broadcast for new slaves to join the master.
1
vote
1answer
1k views

Network discovery across VPN and local subnets

This question is about interaction between VPN clients and local machines. I have a simple network on the subnet 10.0.200.0/24.  The router supports VPN.  The router forces the VPN IP pool to be on a ...
1
vote
1answer
186 views

Solaris spoof mac impossible

I need to spoof the MAC address in Solaris 10, running in a ESXi VM. The MAC I need is outside the range permitted by vSphere. So I add an "ether" entry to /etc/hostname.e1000g0 so the file says ...
1
vote
1answer
544 views

Broadcasts from guest machine not reached host machine

I have an application that sends UDP broadcasts to some port, for example 11000 (BROADCAST_APP) and another application that listens the 11000 UDP port(LISTENER_APP). The apps works well on the ...
1
vote
2answers
341 views

How to configure a network router to forward (rebroadcast) wcf discovery

I can't perform wcf discovery through a network router. I have a client and server app. When deploying these two apps to any two computers on the same lan it works perfectly. The client app finds ...
1
vote
1answer
587 views

Using SLP (service location protocol) in an environment without multicast (OpenSLP)

Is it possible to use SLP (service location protocol) in an environment which does not support multicasts but just broadcasts? From what I've read it should be possible, but I can't get it to work. ...
1
vote
1answer
521 views

Limiting broadcast traffic illogically. What are the downsides?

We've been thinking through re-arranging the end-user network and VLAN configuration. We're currently doing things in a way that isn't quite typical, but given that it is working, we're hesitant to ...
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
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, ...
1
vote
0answers
234 views

Forwarding broadcast traffic [closed]

I have a host that receives broadcast queries on a UDP port. I would like to forward this broadcast traffic to another host from another network. Is it possible to port forwarding broadcast traffic ...
1
vote
0answers
121 views

Is there a way to use Sharepoint 2010 Central Admin to send an email to all connected users to alert about a System Restart?

We have Sharepoint 2010 Server running in a test mode on one of the servers in our intranet (LAN) and I would like to broadcast an email to all connected users if any are currently using Sharepoint. ...
1
vote
2answers
429 views

How to configure samba to workaround UDP broadcast problems?

I have a problem that NetBIOS name of my Ubuntu laptop connected through WiFi cannot be resolved from other machines. Using a packet sniffer and nmblookup I figured out that the wlan interface doesn't ...