Although I have no networking experience I'm trying to connect two pc's using an RJ45 cable and two 10baseT cards (one Com3, one SMC). This is so that I can effect an NFS install on the one box which doesn't have a CDROM drive. I'm installing slackware 8.1, and although both NIC's appear to function OK, and I can ping the local box from either, I can get no communication between them. Neither box can ping the other and attempts to set up the nfs install always result in the 'rpc.portmap - unable to recieve' error on the client. I can mount the CDROM as /mnt/nfs on the server. Part of the problem may be that I am using a home-made crossover cable - from a standard A-B cable. I found some instructions for doing this in a HOW-TO where pins 1A is switched to 3B, 2A to 6B and the return similar. However the colour codes on my wire did not match the How-to description, and I'm not sure which is 1 and which is pin8. Colours on mine are brown,blue,yellow,green,red,black,orange,grey - and I've assumed brown is no. 1. Any pointers would be useful . thanks
Glen
On Wednesday, January 29, 2003 7:44 AM, Glen Tyler wrote:
Part of the problem may be that I am using a home-made crossover cable - from a standard A-B cable. I found some instructions for doing this in a HOW-TO where pins 1A is switched to 3B, 2A to 6B and the return similar.
Yes, that is correct.
However the colour codes on my wire did not match the How-to description, and I'm not sure which is 1 and which is pin8.
If you look at the end of a piece of cable, as if it is a rattle snake which is going to bite you on the nose and has it's tail in the air (i.e you are looking at the end of the RJ45 plug which plugs into a socket and the clip is uppermost), or if you imagine standing on it's tail so it's jaw drops as it slithers away from you (i.e you are looking at the plug from the cable end with the clip downwards), then the pins are numbered from 1 to 8 from left to right.
On my crossover cables:
T568A: 1=White with Green stripe 2=Green with White stripe 3=White with Orange stripe 4=Blue with White stripe 5=White with Blue stripe 6=Orange with White stripe 7=White with Brown stripe 8=Brown with White stripe
T568B: 1=White with Orange stripe 2=Orange with White stripe 3=White with Green stripe 4=Blue with White stripe 5=White with Blue stripe 6=Green with White stripe 7=White with Brown stripe 8=Brown with White stripe
Hope that helps.
Ian.
Glen Tyler wrote:
Part of the problem may be that I am using a home-made crossover cable -
*shudder* its very easy to make cables that look as though they will work, work sometimes and so on. Go and buy a cable unless you have a cable tester and can be 100% sure that it will work, In the past when making cables it has been a fiddly pain in the bum and only ever done when really necessary and the long term success rate even with all of the proper crimping tools and cable testers was at best "low"
What you would be best of doing is buying a hub or even better a switch, as they are cheap and a couple of patch cables. Connecting a crossover between two machines doesn't actually have to work, so even if your cable is ok they may not like one another. Basically imho I would rather spend maybe 30 quid and know its going to work instead of stabbing in the dark with "hmmmm, it worked a minute ago" or "well it should work but it doesn't"
Adam
On Wed, 2003-01-29 at 11:31, Adam Bower wrote:
*shudder* its very easy to make cables that look as though they will work, work sometimes and so on. Go and buy a cable unless you have a cable tester and can be 100% sure that it will work, In the past when making cables it has been a fiddly pain in the bum and only ever done when really necessary and the long term success rate even with all of the proper crimping tools and cable testers was at best "low"
I totally agree with Adam.When it comes to network cables, get someone else to do it. If you want to do it on the cheap, do what I do:-
1. Find a skip outside a newly refurbished office. 2. "Appropriate" tens of metres of cat5 from said skip. If someone is about (i.e. the cable company), just ask, they'll give it to you if you say it's for home. 3. Go into your local computer store having cut the length you need (always add at least an extra metre ot two though- why not? the cable was free?), and get them to do it. My local shop do it for 3 quid per cable.
Secondly, http://www.overclockers.co.uk/acatalog/Online_Catalogue_Clearance_Lines_16.h... has a switch for £36, which is only a tenner more than most 4 port hubs, may be worth the extra money.
Hope that helps. :)
On Wednesday 29 Jan 2003 12:04 pm, Ricardo Santos Campos wrote:
http://www.overclockers.co.uk/acatalog/Online_Catalogue_Clearance_Lines_16. html has a switch for £36, which is only a tenner more than most 4 port hubs, may be worth the extra money.
dabs.com has an 8 port "dabs value" switch for 24 quid and screwfix direct are doing 2metre patch leads for under a quid
Cheers, BJ
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Adam Bower -
Glen Tyler -
Ian Douglas -
John Woodard -
Ricardo Santos Campos