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Discussion Starter #1
Personal equipment
Modem: Router(DHCP off) D-link DIR615 working As bridge + fibre optic Modem.
Router: Mikrotik 750G/ Aztech WL830RT4
Firewall used: ZoneAlarm security suite with or without. Both PC have windows firewall OFF Both PCs are using x64 windows 7 ultimate.

Problem details

I test 2 network setups for connecting my 2 PCs.

Network Setup 1. Fibre optic Modem <--> DIR-615 as Bridge <--> WL830RT4 <--> PC1/PC2
Network Setup 2. Fibre optic Modem <--> RB750G <--> PC1/PC2

Problems

Case 1
- using network setup 1.
- Internet = Off (aka disconnect Modem)
- Router = WL830RT4
- Firewall off and on produce same result.

if PC1 ping to PC2 I get ping like this.

Pinging 192.168.1.100 with 32 bytes of data:
Request timed out.
Request timed out.
Reply from 192.168.1.100: bytes=32 time=1056ms TTL=128
Reply from 192.168.1.100: bytes=32 time=1ms TTL=128

if I ping from PC2 to PC1, I got 1ms local ping.

--------------------------------------------------------------------------------

Case 2
- using network setup 2.
- Internet = Off (aka disconnect modem)
- Router = RB750G
- Firewall off and on produce same result.

if PC1 ping to PC2 I get ping like this.

Pinging 192.168.1.100 with 32 bytes of data:
Request timed out.
Request timed out.
Reply from 192.168.1.100: bytes=32 time=55ms TTL=128
Reply from 192.168.1.100: bytes=32 time=1ms TTL=128

if I ping from PC2 to PC1, I got 1ms local ping.
---------------------------------------------------------------------------------
Case 3
- using network setup 1.
- Internet = On connected to modem.
- Router = WL830RT4
- Firewall off and on produce same result.

NO problems on both sides. 1ms local ping
------------------------------------------------------------------------------
Case 4
- using network setup 2.
- Internet = On connected to Modem.
- Router = RB750G
- Firewall off and on produce same result.

NO problems on both sides. 1ms local ping


ok so What the HECK is going on here!?

1. As far as I know firewall isnt the culprit.
2. As long as I stay online my local LAN isnt giving me problems on PC1.
3. ping works on both sides? in this case why 1 sided only?
4. This issue seems to be hardware issue. As it is acting differently
 
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