Network solution

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Network protocols
Networking
Networking Equipment
Hi, Here is my small network: 1-it is in four floure apartment 2-have a central Hub and two Switch without giga port and giga moulde suport(all is 10/100 port)in first floure 3-Threre are one switch(10/100/)in every 3 other floures that connected by one port to a port of the Hub in first floure 4-In every floure there are 20 client 5-There are 4 server in the network: - File server(this server is Master DC too) - Mail server(this server is Additionl DC too) - Application Server - Print server(this server is Symantec Antivirus Server) Problem: Now the traffic in third in too much and sometimes they can't copy a small file from the file server Soulotion : I wana change the network configuration in a good model but I need some information and sources about network model for example "Core layer and Distribution and Access layer" and some help about new suitable devices for using in every one of these layer,and some information about changing the Cabling to Cat6??? Could you please help me? Thank you. ----- Regards Mahnaz
ASKED: August 11, 2005  5:23 AM
UPDATED: August 20, 2005  7:36 AM

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Why do you have a hub in the centre and switches at the ends? Take one of your switches and swap it with the hub. Or buy a new switch and replace the hub. Your traffic problem is collisions at the hub.
There’s no point using Cat6 unless you have 10GB+ enabled switches. Cat5e works up to about 4GB if you’re careful.

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  • HumbleNetAdmin
    I have to agree with the last poster. You should not have hub as a central or core component. Only at the end were maybe its needed to connect a couple of users. You should have switches and not hubs were ever possible and I will explain why. When I device connected to a hub broadcast information that it wishes to communicate to another device on the network, it will broadcast that request to every device connected on the hub and every device will responds with it is not me, or hey that is me. With a packet switching hub (or Switch), when a device broadcast its request to communicate with as another device on the switch, that switch receives the request and says, hey that goes to this device on port so and so and routes it directly to the intended device and then communication between the two devices commences and there is not a lot of extra traffic clog your network. As far as the cabling goes, if you are on a 10/100 network your CAT5 cabling should serve you well. If you plan to start implementing GigE over your network then you might consider CAT5e between the GigE connected devices, if you plan to go to a full GigE network and you find that you have issues with it across your CAT5 (and in my experience you certainly could) then you should consider re-pulling CAT5E or 6. GigE is supposed to be obtainable over CAT5, however, GigE over copper has a stringent standard that the cabling be exact, if not then you have issues. GigE over copper requires that all 4 pair of wires be used verses only two in 10/100. If one of those wires are not connected well or properly in the RJ45 connectors then your GigE will suffer or not function at all. The HumbleNetAdmin
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  • ItDefPat1
    Yes, you are probably getting collisions at hub. how manageable are the switches - do they support VLANS? where possible, break users into VLANS (joining VLANS requires routing capability). this may also help congestion - all client ports are going to a single port for each server. you might want to set up gigabit links between switches and gigabit for the servers. the links between switches and to the servers could be getting high loads, lots of latency. If too hard to upgrade cable for GB, try trunking which combines multiple 100mb (might be switch upgrade). It doesnt sound like you have a loop of switches (switch a connects to switch b, switch be connects to switch c, switch c connects to switch a) - if you do, does your switch support spanning tree protocol (STP). this could also help.
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  • Joelsplace
    They are right. Get rid of the hub! Use QCheck to test speed between your clients and the servers. I have found many (at least 3 dozen of various brands but all WinXP) network cards that would slow down to around 1-1.5Mbs if you set the speed/duplex to anything but automatic. Unless your users are moving huge amounts of data I'll bet you will be fine with 100Mbs once you get it working correctly. Quickbooks and Peachtree are real pigs even on a Gigabit network with 3 users. Joel
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  • ItDefPat1
    Autonegotiate has been a trouble for years, despite the standard. I have seen sometimes that different brands of NICs don't always autonegotiate to work together. This is not supposed to happen. IF you can test, try setting all to 100. compare to when all are autonegotiate. I hate to say if this is very likely (it isnt supposed to happen) but it might be worth a try.
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  • Poppaman2
    All good answers - I do agree that the network should be set up with a switch as the central device - preferably a gig-E swithc to which your other 10/100 switches connect... One thing to add to what ItDefPat1 said: if your network has any Mac clients on it (and in an apartment block with 80 clients, chances are good that a few of them are Macintosh machines), DO NOT impliment spanning tree protocol, as ethertalk will break (the Mac client will not be able to obtain an IP address from your DHCP server or will duplicate the IP address of an existing client). If you give Mac clients a static IP address, STP is OK. As late as early 2005, Apple still had issues with this network protocol (ref: http://manuals.info.apple.com/en/PowerMacG5_(Early_2005)_UserGuide.pdf)
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  • Aliyani
    Hi,but why I only have traffic in the third floor and users in this floor couln't connect and use of network as quickly as others!!!???? Thank you. ---- Regards Mahnaz
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  • EngineerIT
    There may be a possibility that any node on 3rd floor is infected by virus/worm and causing heavy traffic on that part of the network. Make sure all the computers are having upto date security patches etc. You definitely need to change the HUB from the central position and must have switch there.
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  • Aliyani
    Hi,then acording your comments I must connect clients to switches but how about Servers? Thank you. ----- Regards Mahnaz
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  • ByteKnight
    Hello, Based on what you have said you have 60 clients, plus 3-5 servers - Please respond if that is correct. If the above is the case, then it's time to start looking at a little higher end switches (Noting less the $200) that can handle larger MAC tables and a little manageability would be nice. Get a manageable switch as your core, put smaller workgroup switches at the edge of your network, feed one link from each floor down to the central Managed Switch, then plug in all Servers into that Central managed switch. I would suggest you get managed workgroup switches at the edge also so you can see problem quicker (SNMP and Logging back to a Logging server (Small application on one server)). Cat 5 or Cat 5e cable would do fine (300 Feet Max distance) that could also be your problem, if it?s over 300 Feet then look at an even larger switchs with Fiber Uplinks. With 60 clients your running a business, invest in it. Regards, BK
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  • Rigveda
    If you are anyway considering reconfiguring your network, then why don't you look into the future and use a 10GbE solution (switches as well as NICs) to provide better performance and take care of clogs. As one of the replies stated, "it is your business, so invest in it". Better secure your future. SC
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  • Guardian
    Yes you have to change to Switches it provides better controll over traffic (and broadcasts), maybe try creating broadcast domains. Since you already know where the most traffic is, try and place them in a Group (subnetting well thats another matter-but for the future its a possibility)of their own, whilst the other less traffic creators (users) can use the other range of addresses with little interfence. You have to plan your network setup correctly. Poor planning will affect you and the network (and prepare for any future user relocations- especially those in you third floor)
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