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#1
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Can'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! |
#2
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reset both lan and modem pull power on the hub/switch/router and
the modem "Emil Lam" wrote in message om... 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! |
#3
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Try here http://www.careyholzman.com/netfixes.htm or here
http://www.practicallynetworked.com/.../troubleshoot/ "Emil Lam" wrote in message om... 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! |
#4
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Emil Lam wrote:
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. |
#6
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"Steve Winograd [MVP]" wrote in
: 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. Bull****. 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. |
#7
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In article , Steve Winograd
[MVP] says... 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. -- Norman ~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 |
#8
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In article , Norman
Miller wrote: In article , Steve Winograd [MVP] says... 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. 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. -- Best 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 |
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