now way to ping BP250

[tarikkk]

Hi every body
Here is my network:
I have an entering point router which public adress finishes by 2.82 then a second with 0.137 then a floor router with 3.81 and then a switch with a BP250 with 3.82 and a PC with 3.84 on the switch
The problem is:
when I ping the PBX from a trace server like

http://www.traceroute.org

the trace stops at the 2nd entering building router which adress is 107.
but when I ping the PC the ping replies and pass through 82, 107 and 81 routers
At the same time why the router stops a ping to PBX and not to PC
I reverse the adresses, I put a cross cable in stead of the switch, I changed the PBX, I did almost everything, no way to ping the PBX
I think that if the problem was on PBX the ping should stops at 81 router not 107
I'm getting crazy with this problem, if you have any idea please give it to me
The default gateway on the PBX and PC is 3.81 adress Subnnet mask is 255.255.255.248

Thans in advance

 

[pcasi]

Sounds like a gateway configuration problem form BP250, are you sure router 81 address is configured as BP250 gateway?

Are you using a routing protocol or is it static routing?

Can you ping to BP250 from all of the routers involved?

Can you ping from other devices on the same subnet (3.81 to 3.86) to BP250?

 

[tarikkk]

No the gateway is correct on BP config
Yes, I can ping BP from the same subnet and from behind 81 router too it's when I'm outside that I cannot ping.
I don't know what routing protocol they are using since the routers are managed from other people not me.