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February 11th, 2002
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 LAN header programming question someone explain the protocol for this LAN: header you have and how private networks work with this, what are typical set ups? does everyone just plug into a ethernet plug (what type) built into every dorm wall, turn on their computer and do a dhcp from some central server or do they have to be assigned a ip from some admin thing? who decides what server gets to be a dhcp, and can they just turn you off if you use too much bandwidth? any ways around this? do you have to log into some sort of proxy? how does that work? can I come there and plug in as a guest? library access? wireless? details, details, thanks! (links?)  |
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February 11th, 2002
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| A campus LAN structured just like the gnutella network over the internet, decentralized, pretty much randomly connected nodes. LAN mode isnt bounded to a specific IP range, clients idenetify themselves to others as being part of a certain private LAN and connect to each other. The 'map thing' creates an interpretation of where all the nodes are in the lan and how they are connected. |
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February 12th, 2002
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| I am trying to understand this, please read the comments below and it would help if you commented your code a little more in this section. Code:
if(m_pDoc->ModeVersion6 || m_pPrefs->m_NetworkModel == NETWORK_PRIVATE)
{
// so m_pDoc->ModeNetwork is "GNUTELLA" or your
// private name "GUERILLA"?
Handshake = m_pDoc->ModeNetwork + " CONNECT/0.6\r\n";
Handshake += "User-Agent: Gnucleus " + GnuVersion + "\r\n";
// why do people have to download a special version
// for LAN use when this seems to be a option
// in a prefs file?
// So the header for my campus would be say:
// LAN: NYcampus
if(m_pPrefs->m_NetworkModel == NETWORK_PRIVATE && m_pPrefs->m_Lan)
Handshake += "LAN: " + m_pPrefs->m_LanName + "\r\n";
//Handshake += "X-Ultrapeer: true\r\n";
Handshake += "\r\n";
}
// and here is where you look for a LAN name
// that matches yours
// Connect string, GNUTELLA CONNECT/0.6\r\n
if(Handshake.Find(NetworkName + " CONNECT/") != -1)
{
if(m_pPrefs->m_NetworkModel == NETWORK_PRIVATE && m_pPrefs->m_Lan)
if(Handshake.Find("LAN: " + m_pPrefs->m_LanName + "\r\n") == -1)
{
Close();
return false;
}
Send_ConnectOK(true, false, Guerilla);
return true;
}
// So who decides on the LAN name?
// What if there are two names? club beta and club alpha want their own!
// how do you kick start this?
// how do others find the network? port scans?
// The campus LAN can't use IP's that are for "outside"
// internet connections, so my question still stands
// as to what IP blocks a campus generally uses
// how do you prevent this from accessing the outside internet?
// This GURELLA thing, is your admin actually looking
// at each packet as it goes by and filtering it if
// it says GNUTELLA ? What a jerk!
// cant he just look for your little LAN: header and shut you down in a minute?
// did you try to go talk to the guy about all this?
// didn't you pay for the network with your fees?
// is there a problem actually using it?
// is it 100mbs?
// what about "after hours"? what would be wrong with that?
// anyone interested in a private wireless network there?
// could the admins screw that up too?
// where does school property end and your private life begin?
// why don't you make a program that watches for his name
// on the network, then quickly blasts
// the ethernet with crap for 50 us to cause
// a collision every time he tries to send / get
// mail. The guy is a jerk.
// you didn't say what type of LAN cable you get there.
// did the_gdf agree on the header format for "LAN:"?
// have you posted to the_gdf your specs for chat so they can be compatible?
// so can you please read my first message and answer some of the
// questions? I am trying to learn more about
// campus LANs
// please comment this stuff so people know what you are doing
// the below is some author private way of doing things
// right?
// I don't know why you can't do this in a prefs file so others can do this too
// (with a different name of course)
if(Guerilla)
NetworkName = "GUERILLA";
// where do people post patches and do/have you accepted them in the past?
// how do you create a patch that everyone can use? |
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February 17th, 2002
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| By: arspolitica ( Cameron ) Setting up a private network on a college LAN 2001-10-05 12:50 Currently I'm a first year student at UCLA. I know a bit about computers and networking, but I'm having difficulty setting up a filesharing network on the lan. The reason I would really like to set one up is that UCLA has been having bandwith problems related to Nimda and Code Red, and having been throtling bandwith and cutting off ports wherever they can. This includes very slow downloads from Morpheus and an inability to connect to the Gnutella network. The campus is so big, that a private gnutella network would be awesome, and I'm sure that I could get a number of nodes on the network. I've been trying for a week now all the various gnutella clients trying to get a private network up and running but without any success. Gnucleus appears to be the best gnutella client, and has built in options for a college network. Can someone lay out the basics of setting up such a network, hopefully so that others at various colleges can use this as a resource should they decide to do the same. -Thanks Cameron By: tman17m ( Tom Gored ) RE: Setting up a private network on a college LAN 2001-10-07 15:15 hey, ive had a similar idea, only im a student at OSU. yes, it would be so awsome becuse it would be fast and have many users...let me know if you find anything out, i will too By: russelharvey ( Russel Harvey ) Is there a 'server' software needed for this? 2001-10-07 23:25 Or the Gnucleus client software here can do it all? Since the public Internet always have some servers for Gnucleus, in a private LAN network environment, would the Gnucleus client that all needed? By: theman2 ( Nick ) RE: Is there a 'server' software needed for this? 2001-10-08 00:35 server: a computer providing services for another computer (this is my definition) any computer can be a server. I can load jgaa's war-ftpd and run an ftp server. the gnutella protocal breaks the divide between client and server, with each node (computer connected to the gnutella network) having the abilities of both. Thus, it does not need some special server software, or even really need dedicated servers to run a gnutella network. A college lan running gnutella would benifit if it had at least one computer hardcoded into the software that is always on. That way, the other computers could get addresses of other nodes from it and always end up connecting to the main group of nodes. There is always the possibility with p2p like networks for groups of nodes to break off from the main group and fragmenting into smaller groups, which is not a great thing if you want everyone to have access to everyone else. A 'server' or two that guide the 'clients' in the right direction would allow for the private network to form a large, unfragmented group of nodes, allowing for the best filesharing! the only thing I wonder is how fast the gnutella software can send and recieve packets. I know from personal experience that just searching for something common like .mp3 can max out the cpu with the results being sorted which causes search results to be dropped and it can even slow down other downloads! If only they prioritized the results sorted to be lower than everything else! If search results through dsl can faze gnucleus, what could a very large and fast private network do? Heh. I think I am going to have to visit one of these campuses to check it out... but I better remember to bring my 80 gig drive to make sure I can test it thurowly(sp?) enough =p By: russelharvey ( Russel Harvey ) RE: Is there a 'server' software needed for this? 2001-10-10 03:56 I guess my question is, is there a 'server' edition of this gnucleus or the so called 'server' are just a bunch of gnucleus which happen to run all the time and get hardcoded into it's program, so to be the first group of host to connect to. Also, the UDP broadcast seems not to be the default behavior, how to switch to that mode if it's built in? By: felixor ( Felix Ordelheide ) RE: Setting up a private network on a college LAN 2001-10-07 15:46 Hi Cameron, i have built up an internal gnutella Net inside our dorm (800+ users with a LAN connection). currently we are peaking at 150 active nodes/ppl and 1 TB shared files(at about 21:00). Setting up a really private gnutella network takes some work and may only be useful if you have a very specific Network structure. A short description of our "setup": Our dorm is "governed" by students we are independant from the university and the only thing we get from them is an uplink (100 Mbit Full Duplex) to the University Net / Internet. The university is mainly concerned about the internet traffic that is caused. Alot of the internet traffic seemed to be large movies and mp3 files - that is why i decided to setup an internal gnutella net in our dorm (where bandwidth is basically unlimited). Our LAN is an 10/100 Mbit switched Ethernet Network with a 155 Mbit ATM Backbone (currently being upgraded to a Gigabit backbone). We do not have public IP Adresses but instead a set of private ip ranges that are routed within the university/other dorms/institutes. There are a couple of modifications i made to the gnucleus sourcecode: 1. different "private" handshake hardcoded into the client 2. A different update server hardcoded into the client that points to an internal server which supplies updates / new versions 3. an internal irc server which is preconfigured in our modified gnucleus installation package 4. Filter lists that deny *.*.*.* and only allow our set of IPs used in the dorm (be careful to exclude NATs / www-proxies). 5. modifications to the upload code to prevent downloads from non authorized IPs I do not know if the whole that i closed with 5. is still "open" in the new gnucleus releases. The problem is that gnucleus only checks the IP-filter lists if somebody tries to connect as a node. It does (did?) not check the IP if an upload request is received. So one stupid fool that connects a lousily configured Linux client like gnut into your internal net opens a giant hole thru which outsiders can easily search / download. Felix By: arspolitica ( Cameron ) RE: Setting up a private network on a college 2001-10-08 22:48 Felix thanks for the help. I really like your setup, and the idea of making our own distribution is a good one. Until your post I didn't realize the true value in keeping the network completely private, but it makes a lot of sense. I know a bit about networking, but I'm hoping someone can help me get things configured correctly. For now I'm just experimenting with my computer and my roomates. The way IP addresses are assigned in our dorms are through DHCP. While my IP address could be dynamic it has been the same since I've been keeeping track the past week or so. I've asked my friends in other dorms, and I've found that all the dorms reside on a 169.232.*.* block of addresses. Playing around with some computers on my floor, by denying the *.*.*.* range and allowing 169.232.*.* I can essentially set up a private network. If I then went in and made some of your changes to the source I imagine the network would remain private. My questions are: 1) How does this setup look? Since I'm not using internal addresses, will a couple thousand students bring down the internet if they all connect? Also do you think it can be secured? 2) What are the steps it takes to setup an update server? What about a pong server? I have a UCLA student website on my dedicated server at Verio (my own little webhosting business) so could I point to students to gnucleus.mysite.com and have them draw their nodes from there. Same goes for the update server. Any other feedback or comments would be greatly appreciated. The demand to set this thing up is great, and I would really like for it to work smoothly before spreading the word and adding nodes. -Cameron By: felixor ( Felix Ordelheide ) RE: Setting up a private network on a college 2001-10-11 04:02 Okay here are my 5$: 1) If you are concerned about bringing down the performance of you dorm network hardcode a speedlimit into the clients. The downloading is what eats up bandwidth the network traffic itself is negligable. 2) Setup an http server with an directory to store the update files. Then just copy the filestructure from the http://www.gnucleus.com fileserver...In the source redirect the update requests to your local server. By: swabby ( John Marshall ) RE: Setting up a private network on a college LAN 2001-10-09 13:23 I've built in a UDP broadcast to be sent out by Gnucleus when it is in LAN mode. What this should do is find other Gnucleus clients running and connect to them without even using a hard coded server cache. It needs some testing, but I know in the latest 1.4.2 it is implemented and working. To see what its doing open the statistics window and view the error tab. By: arspolitica ( Cameron ) RE: Setting up a private network on a college LAN 2001-10-10 00:13 Swabby, The UDP broadcast took a few minutes to get a connection, but it works. Thanks and keep up the good work. Rather than try and explain to the masses how to set up Gnucleus, it will be easuier to create a custom "Gnuclanet" release. The following is what I plan to do to the default release. 1) Remove the default host servers 2) Hard code the IP filter to deny *.*.*.* 3) Hard code the update server to Gnuclanet's 4) Setup a prvate handshake In regards to #4, how would you recommend doing this. In the options -> network tab, you can specify a private LAN name. I've also heard of changing the handshake. Which should I use, or are these two methods one in the same? Down the road I would also like to set up an IRC server, but for now I just want to set up the network. Any suggestions or problems seen in my strategy? Thanks again for all the help, Cameron By: swabby ( John Marshall ) RE:Setting up a private network on a college LAN 2001-10-10 03:12 My college actually filters gnutella connections to the internet by analyzing the connect string, its very tricky but I've gotten by it. Yes I am creating a lan specific version of gnucleus and the connect string will be different. I want to deploy it at my college too. The UDP works, which is good. It seems kind of flaky to me still for some reason, maybe I should send duplicat UDP packets for assurance? By: eagletm ( Gregor Lawatscheck ) RE: Setting up a private network on a college LAN 2001-10-10 15:04 Just like Felix I've modified some parts of Gnucleus for a uni network. It checks for IPs before uploading by connection and pushing and uses port 80 with the Internet Explorer 5.05 User-Agent connect string (hehe). Works quite well... If anyone is interested in getting code to do the same I can supply some. Basic modifications in GnuSock.cpp (incoming connects), GnuNode.cpp (pushing) and GnucleusDoc.cpp (own checking function for IPs to be called in gnusock and gnunode) ------------ UPD Broadcast Problems blackwidow - 1-15-2002 at 11:19 PM Let me get this straight...a client only sends a UDP broadcast when it first opens? Here's the problem, our private gnutella network is up to 85 users and all of them are happily connect with the minimum of 3 connections filled. client A opens and sends out a UDP broadcast, but all 85 clients are silent because they are happy as is. see the problem here? client A has no way of finding any other clients and getting onto the network. more so, client B opens and sends UDP broadcast. client A gets the message and connects to B, making a _separate_ network of 2 users. what's the solution?!? what if every client sent out a UDP broadcast every 10 seconds so that new clients would find someone. any other ideas, and how do I implement this? swabby - 1-16-2002 at 04:20 AM UDP broadcasts in the LAN version are always replied to even if the node is very happy. blackwidow - 1-17-2002 at 06:49 AM strange, because I've been having trouble with new nodes not connecting to the network. there is a possibility I may have crippled the udp ping feature while hard-coding the program to work only on the luthershare network. I guess I'll wait for the next version to come out and be a little more carful with my altercations. for now I just send an automatic 'open' notice to the #gnutella/cache whenever someone joins the channel. that will work untill the server gets shut down. |
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