Unable to ping across subnet

Question

hi
i have a solaris system
hostname sun
router (IP) 10.xx.xx.1
IP 10.xx.xx.20
network id 10.xx.xx.0
mask 255.255.255.0
where problem is
i can't ping from solaris machine(sun) to any PC across the subnet ( with IP as well as name).
resolution
--> /etc/defaultrouter is in order
--> network card is properly setup and running
--> can ping any system on local subnet including router(with IP ! DNS is across the subnet).
--> can ping from other PC's(win) on same subnet to systems across subnet using same default gateway settings
( that is routing settings at router are okay) .
--> netstat -r (shows following output )
sun% netstat -r
Routing Table:
Destination Gateway Flags Ref Use Interface
10.xx.xx.0 sun U 3 2460 hme0
224.0.0.0 sun U 3 0 hme0
default 10.xx.xx.1 UG 0 37756
localhost localhost UH 0 6502 lo0
sun%
--> /etc/netmasks
10.0.0.0 255.255.255.0
--> it takes unreasonably long time to set default interface for multicast during boot.
any suggestions where the problem could be.
thnx
garry

Answer 1

Hi garry
Yes you cannot ping with name unless you dont include that system's name and ip in the host file.
Due to the following reasons, you cannot ping ip across the subnet :
1. The pinging ip may be in a different vlan for which you dont have any access.
2. The default gatway has to be added which is accessable to other subnet also.
To over come your problem :
sample diagram of your problem
sub net 1- - - - - - - - - - - - - - - -
you are here |
sub net 2 - - - - - - - - - - - - route - - - - -dns / internet
|
sub net 3- - - - - - - - - - - - - - - -
is this n/w diag ok.
still you have any problem check the ACL of the router.
Regards
Sridhar M