tcp/ip route tables 2

[mattg]

When adding a route I get an error 87 response. Can't find any detailed info out there. Anyone have an answer? Thanks.<br>
MattG

 

[Tool]

What is the syntax of the route add line? The commmand line may be incorrect.

 

[Tool]

168.118.0.0 mask 255.255.0.0 216.33.124.30<br>
error 87<br>
<br>
I can add this route to one machine OK and get this error on another. Both NT and on same subnet. I'm clueless. Any ideas? Matt

 

[Tool]

Error 87 is an indication that your addressing is incorrect. Here is a clip from Technet explaining two possible reasons.<br>
<br>
You will get the route addition error in at least these two situations:<br>
<br>
1. If the gateway address you specify is not on the same logical subnet as any<br>
of the network adapters in your system. For instance, if your system had this<br>
configuration:<br>
<br>
ip address 204.118.75.20<br>
subnet mask 255.255.0.0<br>
<br>
and you tried this command:<br>
<br>
route add 204.110.0.0 204.110.76.23<br>
<br>
where 204.110.0.0 is the remote subnet you want to reach and 204.110.76.23 is<br>
the gateway address you want to use, you will get the error message because<br>
the gateway is not on the same logical subnet as your system.<br>
<br>
2. If the destination address you enter is a specific host address rather than a<br>
subnet address and you specify a netmask, you will get this error.<br>
<br>
For instance, using the same configuration as above, if you wanted to reach<br>
this specific system:<br>
<br>
ip address 204.110.15.3<br>
subnet mask 255.255.0.0<br>
valid local gateway 204.118.75.1<br>
<br>
you might use this command:<br>
<br>
route add 204.110.15.3 mask 255.255.0.0 204.118.75.1<br>
<br>
and this command would give you the error 87 message. The ROUTE command<br>
expects the subnet address 204.110.0.0 rather than the specific destination<br>
address.<br>
<br>
To correctly add a host route do not specify a netmask and by default NT will<br>
use a netmask of 255.255.255.255, for example:<br>
<br>
route add 204.110.15.3 204.118.75.1<br>
<br>
Or use a subnet mask of all ones, 255.255.255.255, for example:<br>
<br>
route add 204.110.15.3 MASK 255.255.255.255 204.118.75.1<br>
<br>
The mask of all 255s (all 1s) means that the destination address of the packet<br>
to be routed must exactly match the Network Address for this route to be<br>
used.<br>
<br>
Tool<br>
<br>