Re: Router problems
- From: Alan Adams <alan.adams@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Thu, 07 Jul 2005 18:14:10 +0100
In message <4d867262daGroverR@xxxxxxxxxxxxxxxxx>
Rod Grover <GroverR@xxxxxxxxxxxxxxxxx> wrote:
> In article <4D863E37A2%mik.towse@xxxxxxxxx>,
> Mik Towse <mik@xxxxxxxxxxxx> wrote:
> > In article <dag913$gb6$1@xxxxxxxxxxxxxxxxxxxxxxxx> malcolm wrote:
> >> Rod Grover <GroverR@xxxxxxxxxxxxxxxxx> wrote in message
>
> >>> Another thing. The RiscPC doesn't register in the router's list of
> >>> attached devices, only the MS PC. Both computers work and I can transfer
> >>> files between them but the router doesn't seem to know the RiscPC's
> >>> there. Why is this? I only have a one way link using LanMan98 (i.e. I'm
> >>> not using Samba) is this likely to make a difference?
>
> >> I have that exactly the same problem as well, no idea why and no RiscOS
> >> manual to reference. I'm using Sunfish to transfer data between my RiscPC
> >> and XP. Although the problem existed before I installed Sunfish.
> >>
> >> If you fix it please let me know how!
>
> > AFAICT my router only shows computers attached that were allocated IP
> > addresses from the DHCP pool. Could it be that the RPC is using a fixed
> > address?
>
> Both the RiscPC and the MS PC have fixed IP addresses which I allocated.
> The router is 192.168.0.1 and is the default setting
> the PC is 192.168.0.2
> and the RiscPC 192.168.0.3
>
> On the LAN side of the router DHCP is switched off. I don't know if this is
> correct or not, but it works!
>
> > I'm using ROS 4.39 on V-RPC. Since that piggy-backs the XPC side, I can't
> > check & my other two RPCs (3.70 & 4.02) aren't currently connected to the
> > n/w.
>
> Could it be that the router can see the MAC address of the PC but not the
> RiscPC? The router status gives the MAC addresses of the ADSL port, the LAN
> port and the PC. To be quite honest I'm not really sure what the MAC address
> is - can someone explain please?
I'm not sure what information the router is giving you when it reports
"attached devices", but I suspect it is the ARP table.
ARP (address resolution protocol) is used by every device running TCP/IP
when it wants to send data across a LAN. It is used to find the MAC address
of the system whose TCP/IP address is the destination, because TCP/IP
addresses can't be used directoy on Ethernet, or indeed most other forms of
interconnect.
The MAC (media access control) address is what is usually referred to as the
ethernet address, and every adapter made has a unique one. (MAC address is
more correct, because it can include FDDI addresses, ATM addresses etc.
Ethernet is just one form of interconnect.)
ARP is used by your PC for example, when it connects to the router to
examine the stats. The router will use ARP (or rather reverse ARP,
extracting the data from the incoming packet) to match the MAC address with
the TCP/IP address. This is stored in the ARP cache.
The ARP entry expires after 15 minutes of non-use, so it would not be
surprising if the RPC wasn't shown. Try pinging the router from the RPC,
then looking again. (The PC is always going to be shown, because you are
using it to look at the router's stats.)
--
Alan Adams
alan.adams@xxxxxxxxxxxxxxxxxxxxxxxxxxx
http://www.nckc.org.uk/
.
- References:
- Router problems
- From: Rod Grover
- Re: Router problems
- From: malcolm
- Re: Router problems
- From: Mik Towse
- Re: Router problems
- From: Rod Grover
- Router problems
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