Intercom Multicast

Hi.
I'm quite unsure of where I should post this.
I've noticed that there are many posts asking about "broadcasting" a message or using ip phones as a paging system etc.
I've read many answer, like buying berbee product to do so or pluging different kinds of systems to the callmanager to achieve it. Some are even giving advice to develop it but none actually proposed the program.
Well, I'm by no means a programmer (really not at all) but I managed to get something like this to work. Better, I'm willing to share it with anyone that wants it for free. I just ask for feedback and maybe help to improve it : although it's working great for me right now, and since I'm no programmer, I don't know how "elegant" the code is nor how it scales with many ip phones (right now I tested it with "only" 30). Also, I only tested it with ccm 3.3.4 ;
The program is parsing text files to get the lists of phones. There is a menu to choose which list you wish to multicast to. Finally, a softkey closes the stream and "hangup" remote phones (although this feature does not work on 7905-7912 yet).
I hope that future versions check for remote phone status before pushing the stream and maybe a web interface for modifying the lists.
If you are interested, drop me an e-mail at [email protected]

We would be very interested. I've tried to email to your address but it bounced. Do you have another email address?

Similar Messages

Intercom service for multiple remote sites

We are deploying 180 remote locations with IPT. Each site is connected via a WAN. We have a centralized CallMgr (4.1(3)). Each site will be configured with SRST.
Each site will need to be able to intercom other phones within the site. (so intercom will stay within each site).
Is there a service that will work? asp or jsp.
How well will that service scale?
Is there any third party apps that will provide this service?
Thanks
Trae

There are 3rd party apps out there, Berbee's Informacast is one product I've seen but there's others.
Most (if not all) of the intercom products utilise multicasting to do the audio distribution, so generally that's stopped at your LAN border (your network guys may have it setup otherwise though).
There's an intercom example in the SDK you may want to take a look at, but you'll be looking at further dev work yourself to get something beyond the simple example.
cheers

Using UDP broadcast instead of UDP multicast on a LAN (multicast not working on a major UK ISP router)

I've built an Android app using Cirrus that allows users on a LAN to chat in Morse code! - You can find it on the Android Market by searching for 'Morse Intercom'.
It works fine on my network, lots of other networks, but not on probably the most popular fast broadband fibre network in the UK
A friend of mine has let me piggyback on her network from this provider, and the problem appears to be that the UDP multicast packets RTMFP transmits just aren't being put on the wireless network. FYI the multicast address I use is IP 225.226.227.1 port 32112 .
This is probably fixable in the router, but 99.5% of users will never mess around with the router (and why should they), and if possible I would like to fix this in RTMFP.
Is it possible for me to ask RTMFP to not use UDP multicast, but instead to use UDB broadcast for discovering peers on the LAN ? The problematical router (and all others?) supports UDP broadcasting.
I tried setting 'groupspec.ipMulticastMemberUpdatesEnabled = false;' but this just stopped the app working on anything! What is the purpose of this option?
FYI:
To connect without using Cirrus server assistance I use: nc.connect("rtmfp:");
The complete function I use for setting up multicasting is:
private function setupGroup():void
// Create a new Group Specifier object
//trace("setUpGroup: groupSpec = new GroupSpecifier('myGroup/groupA')");
trace("setUpGroup: groupSpec = new GroupSpecifier('" + MY_UNIQUE_GROUP_NAME + "')");
var groupspec:GroupSpecifier = new GroupSpecifier(MY_UNIQUE_GROUP_NAME);
// Enable posting
trace("setUpGroup: groupspec.postingEnabled = true");
groupspec.postingEnabled = true;
// Specifies whether information about group membership can be exchanged on IP multicast sockets
trace("setUpGroup: groupspec.ipMulticastMemberUpdatesEnabled = true");
groupspec.ipMulticastMemberUpdatesEnabled = true;
// Causes the associated NetStream or NetGroup to join the specified IP multicast group and listen to the specified UDP port.
//trace("setUpGroup: groupspec.addIPMulticastAddress('225.225.0.1:30000')");
trace("setUpGroup: groupspec.addIPMulticastAddress('" + MY_MULTICAST_ADDRESS + "')");
groupspec.addIPMulticastAddress(MY_MULTICAST_ADDRESS);
// Constructs a NetGroup on the specified NetConnection object and joins it to the group specified by groupspec.
trace("setUpGroup: group = new NetGroup(nc,groupspec.groupspecWithAuthorizations())");
group = new NetGroup(nc,groupspec.groupspecWithAuthorizations());
// Set the NET_STATUS event listener
trace("setUpGroup: group.addEventListener(NetStatusEvent.NET_STATUS,netStatus)");
group.addEventListener(NetStatusEvent.NET_STATUS,netStatus);
In conclusion - On a LAN with up to 250 or so hosts, I can't see why RTMFP shouldn't be able to use UDP broadcasting as an alternative to UDP Multicasting. Can it, and if so how?
Graham

Here's more information...
When trying to connect with a 3rd party product, the connection request is sent out to my ISP's DNS server with details of the service ID. Of course it won't find anything there.
So then is tries to use NBNS (Netbios Naming Service) on 192.168.1.255, and still can't connect. Then comes back with a TNS error. i tried TNSPING on this address, and it doesn't find it. I have no clue where it gets this address from.
WHY WON'T IT JUST CONNECT TO THE HOST MACHINE AS DEFINED IN THE TNSNAMES FILE???
PLEASE HELP!!!!

Disabling Multicast in Solaris 10

Hi,
I have been searching the internet all morning trying to figure out how to disable solaris 10 multicast. I have no need for it. The best information I could find was to modify the script /lib/svc/method/net-svc and comment out the adding of a route point for multicast near the end of the script.
I thought that hand modifying the methods of SMF was a big no no in solaris 10. Is there a better way to disable multicast?
For instance, if I do an ifconfig -a I see that all of my intefaces have the MULTICAST flag set. Is there a way in ifconfig to disable that flag?
I have seen people put ifconfig options into their /etc/hostname.interface file. I think if I can find the correct ficonfig option I can disable the multicast flag during system boot and that should disable multicast.
Any comments/suggestions would be welcome.
Eric

Now that I have done more research I guess I do not have to turn off the multicasting.
This problem appeared because during snoop sessions I see MANY of the following messages:
? -> (multicast) ETHER Type = 022C ... 53 bytes
I assumed that one of my machines was doing the multicast. However, I shut down all but one machine and then I removed the multicast route from the route table and the messages still appear. I think that either my cisco switch or cisco router is doing the multicast.
So I guess I will not turn off the multicast on the machines.
Does it make sense that the router and/or switch is sending out the multicasts?

Unable to receive multicast on a multi network interface host

Can anyone please help?
I am not able to receive multicast on a multi network interface host.
This is the code:
public class LegacyMulticast {
public static void main(String[] args) throws IOException {
InetSocketAddress group = new InetSocketAddress("224.10.20.30", 12345);
NetworkInterface iface = NetworkInterface.getByName("eth3");
MulticastSocket socket = new MulticastSocket();
socket.setSoTimeout(5000);
socket.joinGroup(group , iface);
byte[] b = new byte[4096];
DatagramPacket datagram = new DatagramPacket(b, b.length);
try {
socket.receive(datagram);
System.out.println("Success");
catch (SocketTimeoutException ste) {
System.out.println("Failure");
socket.leaveGroup(group, iface);
The funny thing is that when I start this code, Wireshark detects IGMP join on the correct network interface caused by joinGroup call, followed by constant UDP traffic on correct port which I aim to receive and finally I see correct IGMP leave caused by leaveGroup call and the UDP traffic stops.
I just don't receive anything on socket.receive call.
I am trying to figure this one out for days now. Pls help someone :)
P.S. I suspected security, but System.getSecurityManager() call returns null.
P.P.S. I also tried implementing this with NIO, but with same result.

public class LegacyMulticast {
public static void main(String[] args) throws IOException {
InetSocketAddress group = new InetSocketAddress("224.10.20.30", 12345);
NetworkInterface iface = NetworkInterface.getByName("eth3");
MulticastSocket socket = new MulticastSocket(12345);
socket.setSoTimeout(5000);
socket.joinGroup(group , iface);
byte[] b = new byte[4096];
DatagramPacket datagram = new DatagramPacket(b, b.length);
try {
socket.receive(datagram);
System.out.println("Success");
catch (SocketTimeoutException ste) {
System.out.println("Failure");
socket.leaveGroup(group, iface);
This is still not working.
The multicast is coming from the network (not localhost), OS is Windows 7.
When I start a multicast stream localy via VLC application on this same group and port, I receive the traffic in this Java application OK.
Once again, Wireshark detects IGMP join and leave and multicast traffic flow on eth3 network interface initiated by the Java application, but it just doesn't see the UDP datagrams.

What is the diffrence between multicasting and broadcasting?

hi friends
What is the diffrence between multicasting and broadcasting?
i'm bit confused in multicasting and broadcasting.

Broadcasts go everywhere within a range determined by the sender.
Broadcasting is deprecated and unliikely to go beyond the nearest router.
Multicasts go everywhere where receivers have declared they are present.
Multicast can be implemented beyond routers in a WAN which you control but ISP routers generally don't support it.

How to protect a PIM-SM network from unauthorized pim routers and multicast sources?

Hi,
we're using pim sparse mode in a customer network with catalyst 2/3/4/6K switches, all multicast routers are redundant with pim dr running for access subnets. RPs are configured with anycast rp.
A) Is there any possiblity to prevent rogue pim routers/igmp queriers connected to host ports from getting connected to the legal pim routers and from getting involved in the local igmp traffic?
Maybe like DHCP Snooping used with DHCP. I read that in the latest Sup2T ios (http://www.cisco.com/c/dam/en/us/td/docs/switches/lan/catalyst6500/ios/15-2SY/config_guide/sup2T/15_2_sy_swcg_2T.pdf) there is a feature called 'ipv4 router guard' which does exactly what we're looking for:
'When configured, the Router Guard feature makes the specified port a host port only. The port is prevented from becoming a router port, even if a multicast router control packets are received. In addition, any control packets normally received from multicast routers, such as IGMP queries and PIM joins, will also be discarded by this filter.'
Afaik, PIM authentication isn't supported in current catalyst ios versions.
Using a normal port ACL is not an option in our case because of a management decision.
B) Is there any possibility to prevent (on a per-subnet basis) rogue sources from sending multicast streams to legal multicast-groups?
Maybe, can I configure a svi of a host subnet or a host port to drop any incoming multicast stream while still accepting IGMP and sending out legal multicast streams?
Using 'ip pim accept-register' command on the rp is not an option because we've tons of legal sources which would end in an very huge error-prone acl
Unfortunately, a normal ACL is not an option here, too.
Best Regards
Thorsten

We use two pim routers in each host subnet for redundancy, they elect the PIM DR.
Does pim passive mode work here?
(Config Guide: If the ip pim passive command is configured on an interface enabled for IP multicast, the router will operate this interface in PIM passive mode, which means that the router will not send PIM messages on the interface nor will it accept PIM messages from other routers across this interface. The router will instead consider that it is the only PIM router on the network and thus act as the DR and also as the DF for all bidir-PIM group ranges. IGMP operations are unaffected by this command. ... The redundant PIM stub router topology is not supported. The redundant topology exists when there is more than one PIM router forwarding multicast traffic to a single access domain. PIM messages are blocked, and the PIM asset and designated router election mechanisms are not supported on the PIM passive interfaces.)
ip pim neighbor-filter maybe would work to prevent rogue pim routers to connect to the legal pim routers but wouldn't rogue pim routers still be able to manipulate the layer2 switch to send all igmp traffic to them and not to the legal pim routers?

How to set up set which NIC card to use for multicast?..

 I just downloaded Rolling Patch 1 for WLS6.0SP2.
 While reading the README file it says
 " ISSUE 42518: Provided a way to set which NIC card to use for multicast traffic
 Can anyone tell me how to set this?. on my WebApplication server it has two NIC
 cards and I want to use the NICcard which is being used to talk to internal network
 for multicast messages.
 One more thing,
 Can anyone one tell how to search for bugs (ISSUES) in weblogic. I am looking
 place where I enter ISSUE number and should get the detailed description of bug/issue
 etc..
 Thanks for helping,
 Nilesh


 Thanks Kumar, I'll try this.
 Does this -Dweblogic.interfaceAddress used only for multicast. Or this is also
 used to talk to AdminServer?.
 The other problem I am facing is when I restart the AdminServer in recovery mode
 it's not finding my WebApp servers, because my webapp servers are on public network
 and my admin (management) server is on private network.
 please look at http://newsgroups.bea.com/cgi-bin/dnewsweb?cmd=article&group=weblogic.developer.interest.management&item=1217&utag=
 , for more details about my problem.
 Thanks,
 Nilesh
 Kumar Allamraju <[email protected]> wrote:
 ><!doctype html public "-//w3c//dtd html 4.0 transitional//en">
 ><html>
 >You should be able to do it via console in 6.1
 > Not sure if it was added in 6.0
 >For 6.0 you can set this via command line
 > java -Dweblogic.interfaceAddress=<addr>
 >You need 6.0 SP2 RP1
 >--
 > Kumar
 >Nilesh Shah wrote:
 ><blockquote TYPE=CITE>I just downloaded Rolling Patch 1 for WLS6.0SP2.
 > While reading the README file it says
 > " ISSUE 42518: Provided a way to set which NIC card to use for multicast
 >traffic
 > "..
 >Can anyone tell me how to set this?. on my WebApplication server it
 >has two NIC
 > cards and I want to use the NICcard which is being used to talk to
 >internal network
 > for multicast messages.
 >One more thing,
 >Can anyone one tell how to search for bugs (ISSUES) in weblogic. I
 >am
 >looking
 > place where I enter ISSUE number and should get the detailed description
 >of bug/issue
 > etc..
 >Thanks for helping,
 >Nilesh</blockquote>
 ></html>
 >

Need help to deploy IP Multicast in private network

Hi,
I am currently working on a project where there is an urgent requirement to deliver an IP multicast solution.
The network itself is fairly simple.
IP Cameras as connected to pairs of Catalyst 2960 switches in 'access nodes'. There are 8 cameras per node, 4 on each switch. There are multiple nodes, 3 at the moment in our testing environment, all trunked together, so 24 cameras in total.
The Catalyst 2960 switches are trunking to a Core node, which consists of a pair of Catalyst 3750 switches with MHSRP configured for each of 8 VLANs, with 2 DCs and 2 Video storage servers for storing camera footage attached to access ports on those switches. We also have workstations attached to the core node switches which have software installed to view live images and manage the cameras across the network.
We have no routing - the access switches have default gateways pointing to the VLANs SVIs configured on the core switch, and each function has its on VLAN. InterVLAN routing is enabled on the 3750s and connectivity is working fine.
I wish to send a TCP stream to the Video Storage servers for storage, and to multicast to the workstations so that the software can see multiple streams from multiple cameras.
Could someone please suggest a suitable deployment strategy, including how to configure the cameras and switches appropriately to allow this to happen? I am struggling to understand what type of configuration is required.
Much appreciated. I'm actively viewing this thread for assistance.

Paul
I don't think IP Base supports any PIM mode other than PIM stub routing (unless you know otherwise) so your solution wouldn't work. Or perhaps i am not understanding ?
Martin
I think the only way forward is to test what we have already covered.
I didn't realise this was a test environment so at least you can try all things out without worrying about the production network.
The thread i linked to suggested that you can get the routing working even without a L3 device capable of running full multicast routing but at the moment the question concerns those extra commands you can't enter. Can you verify they are not available in config mode ?
An additional problem is because PIM is passive on the SVIs no IGMP queries are being made so there is no way for the switches to work out which ports needs the multicast stream and so it will be flooded.
There is a function, supported on the 3750s called the IGMP querier function which allows the switch to make IGMP queries per vlan without PIM enabled. We may be able to use this but i have absolutely no idea how it will work with the L3 multicast routing config.
I recommend you try and get multicast routing working first. If you can get to the stgae where you can send a multicast stream from one vlan to another then you should be able to use wireshark to then see each port in the destination vlan receiving the stream (even when you don't want it to).
If you can get to that stage we can then try the IGMP snooping querier to see if we can restrict the stream to only those ports that need to receive it. It may be we can't in which case -
a) you could statically configure the multicast mac address to the relevant ports but this is no scalable and does not allow clients to dynamically join and leave the multicast group
or
b) simply allow the stream to be flooded to all ports within the destination vlan. Not ideal and kind of defeats the purpose of multicast but you may have no choice.
I doubt whether any of this would be supported by Cisco though as i think their position would be to simply upgrade to an IP Services license although in understand this may not be possible for you because of cost.
Jon

Chat room using multicast socket

hi-
i have a chat room based on multicast socket with a SWING GUI interface. i want group members to be able to establish a shared secret(bases on extended n-party diffie-hellman algorithm) to encrypt all messages exchanged . Re-keying happens upon member join and leave. In order to do key agreement i need to identify the number of subscribers in the multicast chat room all time. i am having trouble setting up a centralized counter to keep track of distributed users 'cause each time a user joins the chat he or she invokes a different copy of the chat program(command line usage: java chatroom <user name>). please help me setting up a counter to count the subscriber and identify joins and leaves.... my main questin is where within the program to set up a counter variable like this to keep track of distributed users? please help...thanks!

thanks for your reply... ummm yeah securing a chat room based on multicast poses many problems mainly because of the lack of a chat server. i really haven't gotten any of them sorted out. well the only reason to use encryption is to provide perfect forward secrecy and backward secrecy, meaning a user who just joined the chat room can't decipher any previous session of conversation prior to his join and a user who just left the chat room can't use the group session key he had to decrypt any future conversation. Access control and authorization is ignored. User can join the chat room without permission of the existing members.
yes a flat hierarchy is assumed(all group members are treated equally....no fixed member is given privilege to generate and distribute keys). However, for the key agreement protocol to take place the last joined member is chosen as a group leader and is responsible of re-keying his share in the previous group session key. The newly joined member adds his share and everybody computes the new group session key based on Diffie-Hellman. This group leader role floats...
you are right... without being able to detect joins/leaves and the correct order of those joins and leaves, none of these can be realized.
Can i chain a separate server just to keep track of membership changes?

Airport Extreme multicast rate and closed network

New to Airport Extreme.
Is the multicast rate the same as the TX rate on other routers? I chose 11Mbps during the setup and my Macbook was very slow. I moved it back to 2 Mbps and it sped up. Distance from macbook to airport approx. 24 inches.
Other question/ statement. I assume that the closed network portion of the setup is the same as turning off the SSID of other routers. Do I assume correctly?

goldengti, Welcome to the discussion area!
Is the multicast rate the same as the TX rate on other routers?
Sorry I don't know about other routers. The multicast rate defines the minimum data rate the base station will use and maintain the wireless connection. If you set it to 11 Mbps, the wireless connection will be broken if that data rate can't be maintained.
Other question/ statement. I assume that the closed network portion of the setup is the same as turning off the SSID of other routers. Do I assume correctly?
Yes the same useless option. Regardless of how you set this option on any router, the SSID is still broadcast between any connected clients and the base station. Therefore it only takes a few seconds to discover the SSID.

A follow-up Multicasting question (brh0001?)

But does the fact that I can't use my LocalHost to multicast internaly, mean that I must be connected to the web throughout the simulation??
(Otherwise I got "Network unreachable".)
Mustn't there be some alternative?
Thanx.

Yep, I am trying to run the whole process on the same machine.
In fact it's the first project I run on LINUX and I haven't got the right modem for net connection from there...
Thanx-a -lot, anyway.

ITunes 11 Stops Responding to Bonjour Discovery Multicast Broadcasts, Why? This stops the the Apple TV 3 from being able to start a new stream from the home share and the iPad remote app can no longer see the home share too.

I'm having an issue where my Apple TV 3 and all our iPads periodically seem to loose connectivity to an iTunes home share on a Windows 7 PC. Using a network protocol analyser on the PC I have identified that the point of failure corresponds to the ATV3 sending a bonjour discovery request and getting no reply from iTunes. Why the ATV3 'forgets' where the home share is is possibly another issue but the root cause of the failure is that iTunes, or more specifically the mDNSResponder service, is not responding to the UDP multicast port 5353 broadcast discovery packet sent by the ATV3 or iPad. The mDNSResponder service does start responding again after iTunes is restarted thus making the home share accessible once more, however, this frequent drop out is unacceptable and often happens after only a single TV show has been watched from the home share making the solution unworkable for a family, we simply cannot be restarting iTunes constantly it ruins the user experience completely!
The nature of this failure indicates that the ATV3, the iPads, the host PC and network are all working correctly and the point of failure here is the lack of response to the bonjour discovery protocol with the net result of either a spinning 'connecting to home share' message or the home share just disappearing from the computers section.
If there is a configuration fix for this please let me know as I haven't located a fix! Otherwise this seems very much to be a code flaw in iTunes 11 or the mDNSResponder and I would appreciate some input from Apple! Going on other questions in these forums it would seem the problem is not limited to Windows PCs but also Macs too. NB: This is not a TCP issue, when the ATV3 or iPad knows the IP of the iTunes server all works flawlessly, it just periodically they seem to refresh the list of home shares and at this point they loose the information about the home share they have just been using because of the non-response to the UDP multicast discovery broadcast packet, that is arriving at the host PC and isn't being blocked by the firewall.
Many Thanks!

In my case there was no import from a former mac.
My problem (at least mine) is that no app that offers media sharing works properly. Neither itunes home sharing nor AirVideo nor EyeTV sharing.
So I'm pretty sure that this is network issue.
Adding another user on my mac and sharing a new library works not also. But sharing from another laptop in my WiFi works. So this has to be a network issue on my mac, not only my user, but an issue of the whole system.
But I'm not willing to reinstall MacOS X for that if I don't have to.

Temporary wim-files for multicast transmissions still needed for WDS installation in Server 2012 R2?

Acording to
https://technet.microsoft.com/en-us/library/dn281955.aspx one of the new features for WDS in Server 2012 R2 for multicast is:
Improved multicast deployment by eliminating the need for making a local copy of the install.wim file. You can apply the install.wim file while it is being downloaded without significant impact to the application process.
However, this doesn't seem to be activated by default and I still get the following error when installing one or more machines using multicast:
"Windows Setup cannot locate a valid hard drive to store temporary installation files." However, once I remove Multicast from this install image, it installs without any problems at all.
I have also noticed that while multicasting, the installation will use the "Copying Windows files" phase, while downloading and copying the install.wim (or whatever name it is) locally on the hard drive first, so this will require lots of space.
So the question is, how do you enable this new feature that should be a part of WDS in Server 2012 R2???

Full version:
Following steps could help enable the feature:
1. Mount the boot image using dism.
e.g.
>dism /mount-wim /wimfile:c:\remoteinstall\boot\x64\images\boot.wim /index:2 /mountdir:c:\mount
2. Create a metadata file if no existing one. The metadata file should be in mountdir from the first step under mountdir\sources. And the file name should be: WdsClientMetadata.txt
3. Add entry to the metadata file: WDS.Client.Multicast.WIM.Streaming.Enabled=true
4. Save changes and unmount the boot image
e.g.
>dism /unmounts-wim /mountdir:c:\mount /commit
Sorry for the late reply, but I had to test this thoroughly since I didn't get it working right away. I tried both the regedit you first mentioned, and later also creating a textfile in the "/index:2 boot.wim", both without any success. I noticed
that creating the sources\WdsClientMetadata.txt with the data "WDS.Client.Multicast.WIM.Streaming.Enabled=true" gives me an error upon booting into WDS as follows (EUFI/IPv6-boot):
Same happens if I boot using IPv4 (an non-UEFI boot), except that there would be a plain IPv4-address instead in the error msg. Just for troubleshooting I tried writing WDS.Client.Multicast.WIM.Streaming.Enabled=false in the file instead, and WDS would throw
me the exact same error message. Once I delete the file sources\WdsClientMetadata.txt from the WDS/Boot image, the client boots ok, both for IPv4/IPv6. Disabling the firewall on the WDS didn't help, so something in the configuration is still missing? I'm getting
to a dead end here, and I suppose you're all out of advice on this one?
Thank you Shaon Shan for your great effort so far.

Adding Time Capsule (for Multicast DNS) to existing router

I have recently moved into a place where I am sharing internet with others (family).
My macs can see their PC's. My macs cannot see my macs.
Wireless Macbook Pro
Hard wired Mac Pro into Netgear router.
I am pretty sure it's because their router, (Netgear, has regular and 5g band) does not have multicast DNS capability, which I understand is necessary for macs to see each other on the network.
I have an older Time Capsule (the one with one band, and no guest login network) that works just fine when it's configured to be the only router on the network. It's worked for years at my previous place using DHCP thorugh a DSL modem.
Question: How do I add the Time Capsule to this network to get Multicast DNS capabilities? OR... is there a different way of getting my macs to talk to each other and still have the internet work?
My relative is a gamer and very particular with his electronics and I don't want to 'remove' the Netgear router from the equation, but I do want my macs to sync up. I run sync jobs to keep certain folders up to date in two places. (No, I don't want to use a cloud for some of this stuff). I have limited experience configuring networks -- I tried plugging in the time capsule into an ethernet port on the netgear router, but I must have configured it wrong because there were conflicting IP addresses and the internet became unusable.
Thanks in advance.

The TC should work ok in bridge mode.
Just go into the airport utility and ensure your TC is bridged.
All routing should be happening on the Netgear.
The printers should then be accessible to the computers.. BUT the TC seems to hate new setups.. I strongly recommend you simply factory reset it and redo the setup.
Use SMB type names.. that means short, no spaces and pure alphanumeric.
And sometimes if you want to print the client will have to connect to the TC and not the Netgear. Mavericks in particular seems to have real issues working with a TC that it is not immediately connected to.
I run somewhat similar setup and right now my airport utility utilty shows the entire history of my network fiddling.. i will have to figure out how to reset airport utility.
As you can see nothing is available because I am plugged into the main router.. my equivalent of your Netgear.
Now I turn on wireless and connect that directly to the TC, lo and behold, the world comes to life.
That is because the new airport utility totally depends on wireless. It is absolutely useless if you use ethernet.
Also remember to check the computer has ipv6 set to link-local.
Apple have made this essential part of the airport network.. you should do this for both wireless and ethernet in the computer. And check that it is set correctly in the TC.
So for example here is what wireless in the computer looks like.
And in the TC. It is in the internet tab under the internet options.

Intercom Multicast

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