Questions tagged [broadcast]

For questions about broadcasting in computer networking. Use this tag when you are troubleshooting or configuring network devices in relation to broadcast.

Filter by
Sorted by
Tagged with
2
votes
2answers
319 views

'Copying' UDP Broadcast to Specific IP Address?

I'm very inexperienced in networking, so please pardon any idiocy. We are mechanical engineers trying to connect weird hardware that talks on Ethernet. We have a device A that can only send UDP ...
1
vote
1answer
509 views

the difference in dealing of Layer 3 Switch and Router with broadcast communication

How does L3 Switch deal with broadcast communication such as ARP,DHCP or Broadcast storm? Is it the same that router deal with such as blocking a broadcast communication or ip address "255.255.255.255"...
2
votes
1answer
627 views

Why does a sever's host automatically broadcast an ARP request after a server attempts to reply to a BOOTP request?

I realise BOOTP is a legacy system, but this is for my reading for my studies. Consider a client, C, that is bootstrapping itself. It sends a BOOTP request to the server—obviously because it does not ...
2
votes
2answers
750 views

Arping for local broadcast address

Given the local IP-network 10.173.128.0/24 I am looking at a wireshark and there is an ARP for 10.173.128.255. Why would a network client ever ARP for a broadcast address? Does this indicate a ...
3
votes
1answer
224 views

broadcast packets snmp graph shape

I recently started using OpenNMS to monitor our LAN. I found this broadcast packets graph on several devices. I'm trying understand the consistency (shape) of these data. Most other graphs, for any ...
2
votes
1answer
127 views

Losing data when broadcasting over switch

I set up a port based VLAN on the first few ports of a 10GbE switch for broadcasting a UDP data stream. The data stream should use maybe 1/4 of that bandwidth. The switch is a netgear M7100. The ...
1
vote
2answers
2k views

HP ProCurve Auto WOL MAC Address of offline devices

I'm attempting to build a system to Auto-WOL devices when plugged into HP ProCurve switches (2510G and 2530G models). This is on a completely flat network, no VLANs or subnet routing. If you'd like ...
1
vote
1answer
288 views

What does Round Trip Time / Transmission Time tell us?

To phrase it as it's phrased more commonly: What does RTT/T tell us? I've seen this formula - Transmission Efficiency - mentioned a lot when it comes to networks: β = RTT/T But what exactly does ...
2
votes
1answer
81 views

Valid broadcast and multicast addressing

The other day I ran across a piece of software configured to "multicast" using the address 255.5.6.7. While I've seen local broadcast (255.255.255.255) and "true" multicast (as defined in rfc5771), ...
2
votes
1answer
357 views

force client to send broadcast packet

I have WiFi mesh network with more than one AP. So I want to see the clients' RSSI level for each APs to steer them to AP with better RSSI. I am curious whether I can check the RSSI by forcing them to ...
5
votes
2answers
3k views

How does router prevent Broadcast radiation

I just learned networking and according to a wiki article on broadcast radiation prevention, it says: Filtering broadcasts by Layer 3 equipment, typically routers (and even switches that employ ...
0
votes
1answer
81 views

ARP request complexity squared?

Is it valid to say that the complexity of ARP requests in a broadcast domain increases squared to the number of participants, as in the worst case every participant wants to address every other ...
3
votes
1answer
343 views

Do you happen to know why this happened on my outside interface? (wrong subnet, proxy arp)

The OUTSIDE interface on my firewall appliance is assigned IP address .2 The router it's connected to (ISP) is .1 Keeping in mind Proxy ARP was turned on (don't recall doing that, but it was), I had ...
4
votes
1answer
13k views

RIP V2 multicasting looks as broadcasting at IP add 224.0.0.9

In RIPv1 the packets are broadcasted out all ports with dest. IP 255.255.255.255. In v2 they are multicasted with dest. IP 224.0.0.9. In Packet Tracer, this v2 packet is transmitted over all ...
1
vote
0answers
184 views

Is it possible to calculate the path loss in an UMTS system if the current HNB CPICH power and RSCP values are known?

Please let me further elaborate on my question: Let's say we have an HNB with 2 Watts of power allocated for the common pilot channel. This would mean that the radiated signal power at the HNB site (...
2
votes
2answers
2k views

Cisco: Storm Control not filtering packets on trunking port

We have an unknown device causing broadcast storms on the network. I have applied storm control to ever single access port in the location, and yet the broadcast storm exists. I was wondering if I ...
1
vote
4answers
597 views

Calculating link utilization during a broadcast storm

Assume 3 switches connected in a ring topology forming a loop. If STP is disabled, a single broadcast packet is going to create a broadcast storm. If i assume a broadcast packet size to be 100bytes ...
1
vote
1answer
639 views

Identify gratuitous ARP

I want to identify a gratuitous ARP. Can I say: If sender IP address and target IP address equal, it's always a gratuitous ARP?
3
votes
4answers
3k views

How does DHCP assign an IP address?

I understand that IP address is a unique address to identify a machine in a network. But for the first time when i Plug in say ethernet cable of a network to my PC's Ethernet Port, how the IP address ...
14
votes
3answers
31k views

How broadcasting works on different networks?

I was reading DHCP ( RFC 2131 ), I have basic knowledge about Relay Agent and Broadcasting. But for Understanding DHCP in depth, I felt like I have to know Broadcasting and Relay Agent ( RFC 1542 ) in ...
4
votes
1answer
15k views

How do VLANs affect the broadcast domain?

I'm repeating a "LAN Switching and Wireless" module in college and I'm looking over past exam papers in preparation for the repeat exam. One of the questions is What is a broadcast domain? Using an ...
2
votes
1answer
13k views

Difference between local broadcast and directed broadcast [duplicate]

In a Class E IP address , in the first octet,255 is reserved and used as a local broadcast.What does the term "local" signify here?How does it differ from a directed broadcast?
3
votes
1answer
4k views

Why should one server repeatedly ARP for the same host?

I am trying to use Wireshark to find the root cause of a particularly slow network, and started by examining Broadcast traffic. Not only does Broadcast traffic represent over 25% of total traffic (at ...
6
votes
3answers
5k views

Wake on LAN across VLANs in IPv6 network

In IPv4, if I want to send a magic packet to a workstation in another VLAN, I enable directed broadcasts in the remote VLAN and send it to the VLAN's broadcast address. This works great. In IPv6, I ...
6
votes
2answers
3k views

OSPF manual neighbor configuration requirement on NBMA network

Why are OSPF neighbors manually configured on NBMA networks even when you enabled it with the broadcast keyword in frame map statements? Example is NBMA point-to-multipoint access. Thanks.
12
votes
2answers
13k views

Technical difference between a Collision and Broadcast Domain

Many people new to networking wonder what the technical differences between a broadcast domain and a collision domain are. Specifically: What criteria is used to know the boundaries of a collision ...
7
votes
2answers
7k views

ARP Replies can they be Broadcast

I have been informed by certain networking professionals that ARP replies can and sometimes actually are broadcast packets instead of unicast. If and when would you use a broadcast ARP reply?
1
vote
1answer
3k views

What is this UDP 5002 broadcast?

I hope this is an appropriate place to ask this. I'm confused because it's a broadcast at Layer 2 but it's UDP inside a VLAN with a destination to a unicast address (Y.Y.Y.Y). I was just wondering ...
-1
votes
1answer
1k views

Can a Bridge forward frames with the destination as broadcast/multicast

I have a question regarding multicast and broadcast frames on a network bridge. Will the bridge forward these frames from one network segment to another network segment ?

1 2 3