You can use the program niping to check whether an application server (with IP xxx.xxx.xxx.xxx) can be reached via a specific SAProuter (with IP yyy.yyy.yyy.yyy). The program niping can be found in the SAP ARchive packet saprouter*.SAR, downloadable from the SAP Service Marketplace (SMP).
Here is the syntax of the command you should enter:
> niping -c -H /H/yyy.yyy.yyy.yyy/S/3299/H/xxx.xxx.xxx.xxx/S/3200 Wed Oct 31 16:37:09 2007 connect to server o.k. *** ERROR => bytes_written <> bytes_read (1000, 14) [nixxtst.cpp 1002]
Notice that the SAProuter has answered: connect to server o.k. Notice also that 3299 is the SAProuter port (3299 being the default port), and 3200 is the port of an SAP Web Application Server (Web AS) with System ID (SID) 00. In general, for an SAP Web AS with SID nn, the port is 32nn.