IP Multicast is an extension of the Internet Protocol, the protocol that make the Internet work. It supports multicast at a low-level protocol and is, in theory, more efficient than End-host Multicast. However, IP Multicast is not widely available. In fact, the original version of Jungle Monkey used IP Multicast, but we abondoned it because we couldn't find any users who had it.

In eCopy ShareScan OP version 1.0, the Multicast IP information is hard-coded and cannot be changed. In eCopy ShareScan OP 1.1, there are alternative methods to discover MEAP-enabled devices. See the FAQ for discovering MEAP-enabled devices.

IP multicast packets are encapsulated for transmission through tunnels, so that they look like normal unicast datagrams to intervening routers and subnets. A multicast router that wants to send a multicast packet across a tunnel will prepend another IP header, set the destination address in the new header to be the unicast address of the multicast router at the other end of the tunnel, and set the IP protocol field in the new header to be 4 (which means the next protocol is IP).

IP-Multicast works by enabling network systems to join a multicast group that is identified by a multicast address. Multicast addresses are in the range of 224.0.0.0 to 239.255.255.255. Vypress Messenger and Vypress Auvis can join to an unlimited number of multicast groups. For example, when a desktop user joins the address, 225.100.100.100, all of the messages sent to that address from any other system will be received.

The IP multicast software is available by anonymous FTP from the vmtp-ip directory on host gregorio.stanford.edu. Here's a snapshot of the files: ipmulti-pmax31c.tar ipmulti-sunos41x.tar.Z Binaries & patches for SunOS 4.1.1,2,3 ipmulticast-ultrix4.1.patch ipmulticast-ultrix4.2a-binary.tar ipmulticast-ultrix4.2a.patch ipmulticast.README [** Warning: out of date **] ipmulticast.tar.Z Sources for BSD You don't need kernel sources to add multicast support.

IPv6, the next generation of the Internet Protocol, supports multicast. We will consider using it once IPv6 is more widely used, but don't hold your breathe.

This is ok. The system does not use IP numbers to determine if separate computers are being used. This is because IP numbers do not accurately reflect whether or not a computer is unique.

Multicast is an alternative way of delivering video and radio channels at a much higher quality. It's a smarter way of serving large numbers of people. This means more live channels will be available for popular events like the Olympics.

IP multicast is a means of getting IP traffic from one host to a set of hosts without using broadcasting; that is, instead of every host getting the traffic, only those that want it will get it, without each having to maintain a separate connection to the server. IP unicast is where one host talks to another, multicast is where one host talks to a set of hosts, and broadcast is where one host talks to all hosts.

The Multicast TTL (which is specified on the cache_host line of your multicast group) determines how ''far'' your ICP queries will go. In the Mbone, there is a certain TTL threshold defined for each network interface or tunnel. A multicast packet's TTL must be larger than the defined TTL for that packet to be forwarded across that link. For example, the mrouted manual page recommends: 32 for links that separate sites within an organization.

Some network adapter drivers are not able to take direction from more than one application at a time. This is either a hardware or driver bug in the network adapter. This used to be a common problem when multicast was a novelty. Updating the driver for the adaptor may fix the problem, otherwise a new adapter is necessary. We have had a report that the Linksys PC100 Ethernet card will only take direction from one Windows application. The remedy was to replace it with a Linksys Cardbus 10/100.

The IP to Latitude/Longitude program use the WHOIS record of a hostname to determine location. The WHOIS record yields the location of the administrative office for the organization/person that owns that domain. For local ISPs and many others, the WHOIS record provides an accurate location. However, for large ISPs (such as alter.net), the WHOIS record is necessarily sometimes inaccurate, because Earthlink has routers/machines all over the country. For example, the WHOIS record for alter.

Right after the mouse driver loads I get an error that says it can not write to GHOSTERR.TXT which is understandable since it is a CD. That error just keeps rapidly scrolling on the screen.

Use the DNS name as listed above. There is no reason to enter an IP address into your news reading software. Again, use the DNS name as listed above. You have been warned. Do not whine and cry if all of a sudden you can't access because you decided to hard code an IP.

There are a limited number of IP addresses in the world and that number is rapidly being depleted. Once the IP addresses are gone, they're gone--there just won't be any more for anyone else. There is some work being done to establish a new system but it would take a very long time to implement it and it is not near completion yet. So, in an effort to do our part, we minimize the number of IP addresses we use.

When you click on enter the archive, instead of being prompted for a username and a password, you will go straight into the archive. Probably the computer that you are using is not on the range of IP addresses that we have entered into the system for them. You would need to get a more complete range of IP addresses.