PC B can ping PC A but not the other way around??

I have a problem getting one pc to talk to another pc on my home based network. Here is how my network is setup:

On PC A I access the Internet via Comcast cable using an SMC Cable modem gateway (Router A). PC B is connected to a router, Linksys WRT54GS (Router B), which is connected to Router A which is hooked to PC A. Both PCs can access the Internet with no problem. Both PCs are Dell running Windows XP Pro using TCP/IP.

The problem:

PC B can ping PC A and Router A but PC A can’t ping PC B or Router B!

Question?

How do I get PC A to successfully ping PC B?

Configuration info:

PC A -

Ping /all

Windows IP Configuration Host Name . . . . . . . . . . . . : OBandRServer Primary Dns Suffix . . . . . . . : Node Type . . . . . . . . . . . . : Hybrid IP Routing Enabled. . . . . . . . : No WINS Proxy Enabled. . . . . . . . : No
Ethernet adapter Gig Ethernet: Connection-specific DNS Suffix . : wp.comcast.net Description . . . . . . . . . . . : Broadcom NetXtreme Gigabit Ethernet Physical Address. . . . . . . . . : 00-10-18-0B-21-43 Dhcp Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes IP Address. . . . . . . . . . . . : 10.1.10.110 Subnet Mask . . . . . . . . . . . : 255.255.255.0 IP Address. . . . . . . . . . . . : fe80::210:18ff:fe0b:2143%4 Default Gateway . . . . . . . . . : 10.1.10.1 DHCP Server . . . . . . . . . . . : 10.1.10.1 DNS Servers . . . . . . . . . . . : 10.1.10.1 fec0:0:0:ffff::1%1 fec0:0:0:ffff::2%1 fec0:0:0:ffff::3%1 Lease Obtained. . . . . . . . . . : Sunday, August 08, 2004 10:53:55 AM Lease Expires . . . . . . . . . . : Sunday, August 15, 2004 10:53:55 AM
Route print -

===========================================================================
Interface List
0x1 ........................... MS TCP Loopback interface
0x2 ...00 10 18 0b 21 43 ...... Broadcom NetXtreme Gigabit Ethernet - Packet Scheduler Miniport
0x3 ...00 11 11 04 e9 1a ...... Intel(R) PRO/100 VE Network Connection - Packet Scheduler Miniport
===========================================================================
===========================================================================
Active Routes:
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 10.1.10.1 10.1.10.110 20
10.1.10.0 255.255.255.0 10.1.10.110 10.1.10.110 20
10.1.10.110 255.255.255.255 127.0.0.1 127.0.0.1 20
10.255.255.255 255.255.255.255 10.1.10.110 10.1.10.110 20
127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1
224.0.0.0 240.0.0.0 10.1.10.110 10.1.10.110 20
255.255.255.255 255.255.255.255 10.1.10.110 3 1
255.255.255.255 255.255.255.255 10.1.10.110 10.1.10.110 1
Default Gateway: 10.1.10.1
===========================================================================
Persistent Routes:
None


Router A –

SMC8013WG-CCR.

RG Functions: Enabled
Current Time: SUN AUG 08 16:12:35 2004
INTERNET
WAN IP: 66.208.217.35
WAN Subnet Mask: 255.255.255.248

Primary DNS: 68.34.128.5
Secondary DNS: 68.34.128.6
GATEWAY
DHCP Gateway IP Address: 10.1.10.1
Subnet Mask: 255.255.255.0

DNS Proxy IP Address: 10.1.10.1
INFORMATION
Software Version: 2.07.08Pre1
Hardware Version: 1D
Cable MAC Address: 00:04:E2:BC:84:92
USB MAC Address: 00:04:E2:BC:84:93
Wireless MAC Address: disabled
WAN MAC Address: 00:04:E2:BC:84:96
Serial Num: 5007BC8492

PC B –

Ipconfig /all

Windows IP Configuration Host Name . . . . . . . . . . . . : JOELPC Primary Dns Suffix . . . . . . . : Node Type . . . . . . . . . . . . : Hybrid IP Routing Enabled. . . . . . . . : No WINS Proxy Enabled. . . . . . . . : No
Ethernet adapter Wireless Network Connection: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Wireless-G PCI Adapter Physical Address. . . . . . . . . : 00-0F-66-1D-D4-7D Dhcp Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes IP Address. . . . . . . . . . . . : 192.168.1.100 Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : 192.168.1.1 DHCP Server . . . . . . . . . . . : 192.168.1.1 DNS Servers . . . . . . . . . . . : 10.1.10.1 Lease Obtained. . . . . . . . . . : Sunday, August 08, 2004 3:33:18 PM Lease Expires . . . . . . . . . . : Monday, August 09, 2004 3:33:18 PM
Route print –

===========================================================================
Interface List
0x1 ........................... MS TCP Loopback interface
0x2 ...00 0f 66 1d d4 7d ...... Wireless-G PCI Adapter - Packet Scheduler Miniport
0x3 ...44 45 53 54 42 00 ...... Nortel IPSECSHM Adapter - Packet Scheduler Miniport
===========================================================================
===========================================================================
Active Routes:
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 192.168.1.1 192.168.1.100 20
127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1
192.168.1.0 255.255.255.0 192.168.1.100 192.168.1.100 20
192.168.1.100 255.255.255.255 127.0.0.1 127.0.0.1 20
192.168.1.255 255.255.255.255 192.168.1.100 192.168.1.100 20
224.0.0.0 240.0.0.0 192.168.1.100 192.168.1.100 20
255.255.255.255 255.255.255.255 192.168.1.100 3 1
255.255.255.255 255.255.255.255 192.168.1.100 192.168.1.100 1
Default Gateway: 192.168.1.1
===========================================================================
Persistent Routes:
None

Router B –

Firmware Version: v2.07.1, Feb. 26, 2004
Current Time: Sun, 08 Aug 2004 16:35:10
MAC Address: 00:0F:66:49:97:08
Router Name: WRT54GS
Host Name:
Domain Name:
Internet

Configuration Type
Login Type: Automatic Configuration - DHCP
IP Address: 10.1.10.62
Subnet Mask: 255.255.255.0
Default Gateway: 10.1.10.1
DNS 1: 10.1.10.1
DNS 2:
DNS 3:

Sorry for such a long post. I wanted to give as much upfront info as possible.

Thanks to anyone who can help me out

OBandR

Maybe you have blocked ping responses in one of the routers.

Classic sign of a machine with a active software firewall. Disable all firewalls to test. If you can ping both ways re-engage and properly configure to trust the local subnet.

I can ping sites on the Internet from PC A and PC B so I don't think I have "pinging" turned off on either router. I'll try to disable my firewall and retry pinging from PC A to PC B. I'll let you know what happens. Thanks, obandr