Do the radios  show link connection before you reboot?  If so, have you 
tried to MAC telnet into them?
I have a couple that would show down but I could MAC telnet into them.  
All of the onboard functions worked.  Then I tried to ping something 
else and got a buffer overflow error.  Reboot would fix for some period 
of time.  At least with mine I did not have to go to the site.

Forbes Mercy wrote:
> We have been plagued with an ongoing issue in our Mikrotik backhauls.  
> It happens about once a month and only on three radios that feed each 
> other, all other sites work fine.  Site A is my head end, it is a 
> Mikrotik 433 with an XR5 chip that feeds about five miles to another 
> site to Site B.  Site B has the same equipment that goes through a 
> managed switch then passes on to Site C about 7 miles further.
>
> What happens is we are suddenly paged that all three are down.  
> Sometimes Site A stays up, most times not, we can get into Site A since 
> it's the head end and we reboot it, it comes right back up.  Site B and 
> C stay down, we have to drive to Site B and reboot it, it comes back up 
> but Site C stays down.  We have a remote reboot for it from a redundant 
> feed so after rebooting it C reconnects to B and they are all up.  This 
> will happen three or four more times in a single day or not at all again 
> for a month, it's totally unpredictable. The boards are up but not 
> communicating, it also takes down the other 2.4 Mikortik AP's at Site B 
> and that has to be rebooted.  We normally run arp -d to clear up any 
> residual, it sure appears to be traffic related and we are on a bridged 
> not routed network.
>
> The only similarities is it's only this feed, it usually happens in 
> spurts of a day or two then stops for a long time, it always happens 
> during the working day leading me to believe it's coming from a day 
> user.  We run Wireshark but see nothing, we torch the towers and they 
> don't show much unusual.  We're thinking it might be a deluge of traffic 
> between Site B and C and are thinking of putting a PC at the C tower to 
> run diagnostics there.  This is very manpower heavy as we have to send 
> people two places and average down time is one hour to do this.  We are 
> going to turn our network into a routed network this Summer but that 
> doesn't help now.  Any ideas would be appreciated.
>
> Forbes
>
>
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-- 
Scott Reed
Sr. Systems Engineer
GAB Midwest
1-800-363-1544 x2241
1-260-827-2241
Cell: 260-273-7239



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