On 04/04/2017 01:26 AM, Mick wrote: > On Monday 03 Apr 2017 20:21:28 the...@sys-concept.com wrote: >> The new box I installed in remote location has a problem obtaining IP >> address. The box was working perfectly on my local LAN. >> >> In remote location I assigned static IP to it 10.10.0.5 > > Where and how? At the router IP address table, against the PC's MAC address? > > At the PC itself using a static IP address and gateway in /etc/conf.d/net?
The remote location router runs DD-WRT (dhcpd), so all static IP's are assigned via DD-WRT and MAC address. >> Previously this IP was assigned to a Virtual Box but I no longer use it, >> so I assign this IP to a new box. >> >> The box was working for a day, but now when I boot the box I get >> - soliciting a DHCP lease >> - carrier lost > > The "carrier lost" error indicates a link going down. The lease renewal is > likely to fail at least while the link is down. The link failure may be due > to an electrical hard fault, e.g. faulty Cat5e cable, RJ45 socket/plug; or > due > to high electromagnetic interference. Check the router stats for carrier > lost > errors. If the counters show the link is being dropped regularly you should > try to eliminate each component in the circuit the cause of the fault. The cable tester I have (cheap) is showing the CAT5 cable is OK. http://www.primecables.com/p-309139-cab-ss35407-tester-network-cable-tester-crimping-tools-combo-for-rj-45-rj-11-primecables?gclid=CJzU2JKJi9MCFQYMaQodEyIHeA >> Could the old IP get stuck somewhere in DD-WRT router? >> >> ping 10.10.0.5 - gives me no response. > > You may find arping a better instrument for investigating the use of IP > addresses in your LAN. > > >> The Cat5 is about 15-20meter long, I test it with a cable tester, it is >> good (all the lights light up in correct order). >> Cable is plugged in into a new switch. > > Long cables are more susceptible to electromagnetic interference - keep their > runs separate from mains cables. Shouldn't CAT5 be able to handle 100m run? Am not sure I understand, "keep their runs separate from mains cables"? Electromagnetic interference - could be a problem, and it is hard to troubleshoot. >> I'll try to assign different address to it tomorrow and will try a new >> router on Friday. > > The new router should eliminate the router as the cause of the problem. > -- Thelma
