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| Thread ID: 42644 | 2004-02-17 21:52:00 | Erratic Home Network | tbacon_nz (865) | Press F1 |
| Post ID | Timestamp | Content | User | ||
| 216303 | 2004-02-17 21:52:00 | I have 3 PCs in a peer-to-peer network with a dynalink supermini 8-port switch. 2 Pcs run XP home, the other, a laptop, runs Win98Se. The network does function, but if I ping between the machines, I frequently get timeouts. Sometimes just one out of four, sometimes 3 out of four, sometimes no loss at all. Any suggestions as to what might be happening, and where I should look to tweak things? TIA Tony Bacon |
tbacon_nz (865) | ||
| 216304 | 2004-02-17 22:21:00 | check your cables......... other thought is whats your IP settings.. |
robsonde (120) | ||
| 216305 | 2004-02-24 04:13:00 | No I doubt it would be your tcp/ip settings. Pings do get lost every now and again. I can guarantee that if you pinged xtra 100 times you would get considerable losses. Doesn't mean it's a fault it's just the communication between the network | hoopzta (150) | ||
| 216306 | 2004-02-24 04:16:00 | In a local network you should never, ever get lost pings. I wonder if you are using DHCP with a fairly short lease expiry. If a machine is inactive and the lease expires, it won't be visible to the rest of the network. | Graham L (2) | ||
| 216307 | 2004-02-24 08:48:00 | I'm not using DHCP, and the pings that get lost are not always at the "end", i . e . out of four pings I might get ping, timeout, ping, ping, ping . The situation is also complicated that the whole house is "smart wired", so the cat5 goes from the PC to the wall which goes to the smart wiring "hub" (which also links other house functions), to the dynalink switch, back to the smart hub, to the wall and then to the other PC . I've not had a chance to try anything for the last few days, but my next plan is to try to connect the PCs outside the smart wiring and see what happens then, and also see what happens with a crossover cable . The lost pings happen equally between any of the PCs so I am beginning to suspect the house wiring . |
tbacon_nz (865) | ||
| 216308 | 2004-02-24 09:18:00 | As mentioned previously - the wiring has to be closely looked at. For ethernet over cat5 you utilise two pairs in the cable. A pair must consist of two twisted wires (e.g. orange+white/orange). If the terminations have not been fitted off correctly, you can end up with a 'pair' consisting of two wires that are not from the same twisted pair (e.g. one from the orange and one from the green pair). This will give you immense grief in bad packets; leading to just the type of problems you have. One of the most common errors in wiring RJ45s is to terminate the pairs in parallel across the connector (i.e pair 1 = pins 1+2, pair2 = pins 3+4 ...). This is NOT correct. The pairs go to pins 1+2, 3+6, 4+5, 7+8. If you don't have your wiring this way, it is most likely the cause of your problems. :| |
wuppo (41) | ||
| 216309 | 2004-02-24 10:30:00 | don't forget to check the switches, I have had very bad experiences with this make and model of switch. The link would be drooped and the only way to reestablish the link was to power down and the powerup the switches again |
beama (111) | ||
| 216310 | 2004-02-24 21:59:00 | That's really interesting - the patch cables between the switch and the house hub were made up by the installer, so I'll check them out. Is that just a matter of looking at them closely and seeing (if I can) whether the connections are correct? I've got one in front of me as I write - which is pin 1 - left from the side of the clip or the other side? And what are the colours of the pairs? I think I can see white (x3?), orange, white/orange, green, blue and red(or brown)- not in that order. The one I am looking at appears to have white/orange at pin 1 (or 8) and red(or brown) at the other end. Tony B |
tbacon_nz (865) | ||
| 216311 | 2004-02-24 23:42:00 | I thought you were losing one host completely . ;-) But still . . . you don't ever lose pings in a working LAN . Pairs are: colour/colour+white -- e . g . orange and orange/white . If you hold a connector with the cable at the bottom and the latch away from you the connections are 1,2 . . . 8 . The connections used for the pairs are: 1&2,3&6,4&5,7&8 . The important ones are 1&2,3&6 . If they don't have actual twisted pairs Ethernet does not like it . These are RF transmission lines and if the impedances aren't correct, the results are predicable . Bad . |
Graham L (2) | ||
| 216312 | 2004-02-25 03:05:00 | This is getting weirder and weirder. I currently have two of the PCs connected by a crossover cable. I can ping each from each, but neither shows up in the other's "network places". I've obviously munged my settings somehow, but I can't see anything wrong. BTW as far as I can see , the cat5 cables are wired OK. Tony B |
tbacon_nz (865) | ||
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