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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 ...
3
votes
2answers
915 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 ...
2
votes
2answers
877 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 ...
7
votes
1answer
667 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 ...
4
votes
1answer
115 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 ...
1
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1answer
110 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.
0
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0answers
166 views

How change Broadcast ip address manually (CentOS Machine)

i figured out subnet mask & broadcast ip addresses of eth0 device in my CentOS machine are different from datacenter email. datacenter email was like below : Free IP: ...
-3
votes
1answer
62 views

Bandwidth requirement to live broadcast an event on the internet [closed]

I am assigned on project to live broadcast an event on the internet which may have 50,000 user s. This will be a broadcast so all users will see same live video. My query is what would be my bandwidth ...
-1
votes
1answer
125 views

Several logical IP subnets within single physical Ethernet broadcast domain? [closed]

I'm using Xubuntu 12.04 and Wireshark to analyse network traffic in my ISP subnet I'm wired to. My system has the following IP configuration: IP Address: 10.10.103.28 /24 Subnet Mask: 255.255.255.0 ...
0
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0answers
146 views

How to configure Linux to send broadcast packets via a specific network interface?

I've read that OS sends broadcast packets via the 1st interface with IFF_BROADCAST and that you can set/clear this flag with ifconfig [-]broadcast (without an address). But this doesn't work. In my ...
1
vote
1answer
626 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
votes
2answers
106 views

What is the equivalent of 127.255.255.255 for OS/X machines so I can test broadcast udp packets without a network? [duplicate]

I am trying to test my program that makes use of broadcast UDP (not multicast!). In Linux, I can use the 127.255.255.255:64651 address and everything works beautifully, in other words, I send a packet ...
0
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0answers
286 views

Tomato RT-N16 - How to Prevent Multicast Packets from Reaching OpenVPN clients (TAP)

We have a remote (like in the woods) client using a VPN connection to connect to our office, using this link we can monitor and operate the remote client without a few hours drive in the wild. This ...
0
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0answers
110 views

HP network discovery service flooding network with SLP / SRVLOC requests

I am having trouble with "HP Network discovery service" which I think is responsible for flooding my network with SLP/SRVLOC requests. This has happened on multiple occasions on different devices ...
0
votes
2answers
43 views

How to broadcast a command on Windows

I am going to frequently deploy different versions of a program on a cluster of Windows machines (mostly Windows XP), so I am willing to use a command-line broadcasting tool (either built-in or ...
0
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0answers
67 views

openvpn bridged mode: interface config with loopback

I'm currently running an openvpn server using routed mode (ubuntu 12.04) Because I have written a network application that uses broadcast, I think I have no choice but to go to bridged mode. However, ...
0
votes
1answer
139 views

Broadcast forwarding using Linux router

I have 3 VLANs connected by a Ubuntu box acting as a router. Unicast packets are properly routed (machines can ping across VLANs, etc). I am now trying to get broadcast working. I want to be able to ...
1
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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
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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
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0answers
81 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?
0
votes
1answer
266 views

Linux network interface broadcast statistics

I am looking for a way to see the number of Ethernet broadcast frames transmit/received by the network interfaces. I am familiar with many Linux commands,procs and options to get interface statistics ...
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 ...
3
votes
2answers
475 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 ...
2
votes
1answer
194 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 ...
1
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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; ...
2
votes
3answers
794 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 ...
4
votes
1answer
248 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 ...
1
vote
1answer
469 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 ...
0
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0answers
53 views

IP Helper Policies

So I'm fairly new in the higher-end Firewall market - but recently have purchased a Sonicwall (2nd hand for lab) for lab purposes. I have a LAN interface configured on 192.168.0.1 and a Wireless AP ...
0
votes
2answers
1k views

How to forward a TCP/UDP broadcast to another VLAN on a Cisco switch?

I have client software which sends out a broadcast on some TCP and UDP port numbers. The broadcast it sends out is designed to look for the server. But the server is sitting on another VLAN so the ...
0
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0answers
44 views

Lookup Cisco VPN client computer

Our client is running Cisco SSL VPN accessed by AnyConnect clients. Now we have one particular remote computer that is special in such that it connects and consumes services on the network as a ...
1
vote
2answers
242 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 ...
-3
votes
1answer
163 views

How to find which system is broadcasting in network [closed]

I have netgear N150 wireless router model WGR614. I am receiving Google search captcha confirmation for some searches.With message that Google is receiving a lot of requests from our network. How I ...
-5
votes
2answers
448 views

half-duplex and full-duplex Ethernet vs Switches and Hubs [closed]

From a youtube video I came to know of the following things All machines connected to a HUB are a part of a single collision domain. All machines connected to a SWITCH are a part of a single ...
0
votes
2answers
795 views

Broadcast traffic on large vlan in numbers [closed]

I'm looking for the magic number of how many clients make sense to have on a single VLAN, before the broadcast traffic becomes a real issue. Preferably, I'd also like to know what a good number of ...
1
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1answer
941 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 ...
2
votes
1answer
219 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
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0answers
226 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 ...
0
votes
1answer
393 views

arp across subnets which devices can be detected?

i have some devices connected in the same physical network (LAN) but in different subnets. I want to detect them all with the ARP from my computer. My Computer is also in the same physical network but ...
1
vote
2answers
1k 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
4answers
108 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
1answer
182 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
497 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 ...
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 ...
0
votes
1answer
617 views

Broadcast between VLANs

I have a network with 2 VLANs running on a Cisco SGE2010 with the switch acting as the gateway for each vlan: 192.168.10.0/24 VLAN 10 192.168.20.0/24 VLAN 20 Servers live on VLAN 10 and Desktops on ...
-3
votes
1answer
146 views

streaming hd video over internet [closed]

I will like to stream live hd video 24/7 But I don´t like to pay for a video stream server like http://www.viastreaming.com What is the hardware and software you recommend for a 500 simultaneous ...
1
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0answers
118 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
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
2answers
413 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 ...
3
votes
4answers
711 views

What happens if I ask 127.0.0.1 via arp broadcasting?

Will all the computers on the network will answer me?