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Windows Forum / Windows Me / Networking / October 2004Can't connect computers with hub or cross LAN cable
Hi, I met on serious problem with my computers. I have one desktop & one notebook both with windows ME installed. Each of which has a LAN card installed. I could use each of them to browse internet separately (IP auto assigned from ISP). However, as I connected them to my LAN hub AND configured different IPs, both of them couldn't ping the other so they couldn't communicate. I observed my LAN hub LED. When ping command was typed, the packet LED flashed. Other LAN hub LED also worked normal. The same situation happened when I connected them with cross LAN cable. I have checked the manual configured IP addresses & subnet mask, no conflict. I don't have any cable tester to test the LAN cables but those 3 cables (2 straight, one cross) had been used previously with no problem. Could anyone advise what should be checked / tested to further diagnose the problem ? Tks! reset both lan and modem pull power on the hub/switch/router and the modem > Hi, > [quoted text clipped - 20 lines] > > Tks! Try here http://www.careyholzman.com/netfixes.htm or here http://www.practicallynetworked.com/sharing/troubleshoot/ > Hi, > [quoted text clipped - 20 lines] > > Tks! > Could anyone advise what should be checked / tested to further > diagnose the problem ? Does your ISP provide multiple IPs? If not, then you need a router, not a hub. >Hi, > [quoted text clipped - 20 lines] > >Tks! To ping each other and communicate via TCP/IP, the computers must have IP addresses in the same subnet. If they get their IP addresses from your ISP, it's possible that they're in different subnets. If your ISP is assigning public IP addresses to both computers, then it probably isn't safe to use TCP/IP for file sharing, because other Internet users might be able to access your files. They're public IP addresses if they're NOT in these ranges: 10.0.0.0 - 10.255.255.255 172.16.0.0 - 172.31.255.255 192.168.0.0 - 192.168.255.255 If they have public IP addresses, then you need to take steps to share files safely. Possibilities include: 1. Replacing the hub with a broadband router, which assigns private IP addresses to the computers. 2. Installing a second network adapter in one of the computers, connecting it directly to the Internet, and enabling Internet Connection Sharing on the second network adapter. 3. Installing a another protocol (either IPX/SPX or NetBEUI) on both computers and un-binding file sharing from TCP/IP.  SignatureBest Wishes, Steve Winograd, MS-MVP (Windows Networking) Please post any reply as a follow-up message in the news group for everyone to see. I'm sorry, but I don't answer questions addressed directly to me in E-mail or news groups. Microsoft Most Valuable Professional - Windows Networking http://mvp.support.microsoft.com Steve Winograd's Networking FAQ http://www.bcmaven.com/networking/faq.htm > To ping each other and communicate via TCP/IP, the computers must have > IP addresses in the same subnet. If they get their IP addresses from > your ISP, it's possible that they're in different subnets. Bullshit. You do /not/ need to be in the same subnet to ping each other, case in point: IP Address. . . . . . . . . . . . : 209.204.68.239 Subnet Mask . . . . . . . . . . . : 255.255.255.0 Pinging www.google.akadns.net [216.239.39.99] with 32 bytes of data: Reply from 216.239.39.99: bytes=32 time=9ms TTL=242 Clearly 216.239.39.99 is not in my subnet. I do understand your point though, I'm just being anal. > If your ISP is assigning public IP addresses to both computers, then > it probably isn't safe to use TCP/IP for file sharing, because other > Internet users might be able to access your files. They're public IP > addresses if they're NOT in these ranges: > 10.0.0.0 - 10.255.255.255 > 172.16.0.0 - 172.31.255.255 > 192.168.0.0 - 192.168.255.255 As well: 0.0.0.0 - 0.255.255.255 (IANA reserved; see RFC 3330) 127.0.0.0 - 127.255.255.255 (Loopback; see RFC 3330) 169.254.0.0 - 169.254.255.255 (LinkLocal; see RFC 3330) 224.0.0.0 - 255.255.255.255 (spans more than one range reserved by IANA for special use; see RFC 3171 and RFC 3330) None of the above should be routed publicly. SignatureNorman ~Win dain a lotica, En vai tu ri, Si lo ta ~Fin dein a loluca, En dragu a sei lain ~Vi fa-ru les shutai am, En riga-lint >> If your ISP is assigning public IP addresses to both computers, then >> it probably isn't safe to use TCP/IP for file sharing, because other [quoted text clipped - 14 lines] > >None of the above should be routed publicly. An ISP can't assign an IP address in the ranges that you mentioned, Norman -- those ranges are reserved for special purposes and aren't routeable. Only the LinkLocal block can be used on a LAN, and then only if there isn't a DHCP server on the LAN. SignatureBest Wishes, Steve Winograd, MS-MVP (Windows Networking) Please post any reply as a follow-up message in the news group for everyone to see. I'm sorry, but I don't answer questions addressed directly to me in E-mail or news groups. Microsoft Most Valuable Professional - Windows Networking http://mvp.support.microsoft.com Steve Winograd's Networking FAQ http://www.bcmaven.com/networking/faq.htm Dear all, I got the cause. The connection was back to normal after I disabled norton internet security at both computers (NIS 2003 ran at desktop side & NIS 2004 ran at notebook side). However, the problem didn't get solved because it was not a good solution. I didn't know which NIS setting caused this. Actually these NIS had been running long ago and both computers could communicate over LAN. All the thing I did recently was getting live update from norton site few days ago (that NIS 2003 didn't get update for over one month before this problem was found). Could anyone familiar with NIS give me some suggestion ? Remark: I just use default settings for both NIS versions. Best suggestion you're likely to get from anyone in these groups is to uninstall NIS and get something that works with Win9x systems! SignatureNoel Paton (MS-MVP 2002-2005, Windows) Nil Carborundum Illegitemi http://www.btinternet.com/~winnoel/millsrpch.htm http://tinyurl.com/6oztj Please read http://dts-l.org/goodpost.htm on how to post messages to NG's > Dear all, > [quoted text clipped - 14 lines] > > Remark: I just use default settings for both NIS versions. |
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