When I use DialUp and LAN at same time, I cannot access LAN.

[davinderkumar]

Hello,

I am on my company LAN network (DHCP). When I connect my machine to ISP
then I cannot access any machine, any local company website.

Configurations are as followins:

C:\>ipconfig/all

Ethernet adapter Local Area Connection:
IP Address. . . . . . . . . . . . : 10.91.194.159
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 10.91.194.1
DHCP Server . . . . . . . . . . . : 10.91.0.33
DNS Servers . . . . . . . . . . . : 10.91.0.33
10.91.0.44
10.91.0.11
Primary WINS Server . . . . . . . : 10.91.0.16
Secondary WINS Server . . . . . . : 10.91.202.10

PPP adapter MYISP:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : WAN (PPP/SLIP) Interface
Physical Address. . . . . . . . . : 00-53-45-00-00-00
Dhcp Enabled. . . . . . . . . . . : No
IP Address. . . . . . . . . . . . : 10.148.8.82
Subnet Mask . . . . . . . . . . . : 255.255.255.255
Default Gateway . . . . . . . . . : 10.148.8.82
DNS Servers . . . . . . . . . . . : 202.56.230.5
202.56.230.6

In DIALIP -> TCPIP Properties -> General Tab : Use dafault gateway on
network is CHECKED. If I uncheck this then I cannot access internet.

C:\>route print
===========================================================================
Active Routes:
Network Destination Netmask Gateway Interface
Metric
0.0.0.0 0.0.0.0 10.91.194.1 10.91.194.159
21
0.0.0.0 0.0.0.0 10.148.8.82 10.148.8.82
1
10.6.6.6 255.255.255.255 10.148.8.82 10.148.8.82
1
10.91.194.0 255.255.255.0 10.91.194.159 10.91.194.159
20
10.91.194.159 255.255.255.255 127.0.0.1 127.0.0.1
20
10.91.255.255 255.255.255.255 10.91.194.1 10.91.194.159
1
10.148.8.82 255.255.255.255 127.0.0.1 127.0.0.1
50
10.255.255.255 255.255.255.255 10.91.194.159 10.91.194.159
20
10.255.255.255 255.255.255.255 10.148.8.82 10.148.8.82
50
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 10.91.194.159 10.91.194.159
20
224.0.0.0 240.0.0.0 10.148.8.82 10.148.8.82
1
255.255.255.255 255.255.255.255 10.91.194.159 10.91.194.159
1
255.255.255.255 255.255.255.255 10.148.8.82 10.148.8.82
1
Default Gateway: 10.148.8.82
===========================================================================

In this scenario, PING doesnt work as DNS servers are inaccessible.
Please let me know any possible solution.

Thanks,
Davinder

 

[Steve Winograd [MVP]]

Hello,

I am on my company LAN network (DHCP). When I connect my machine to ISP
then I cannot access any machine, any local company website.

Configurations are as followins:

C:\>ipconfig/all

Ethernet adapter Local Area Connection:
IP Address. . . . . . . . . . . . : 10.91.194.159
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 10.91.194.1
DHCP Server . . . . . . . . . . . : 10.91.0.33
DNS Servers . . . . . . . . . . . : 10.91.0.33
10.91.0.44
10.91.0.11
Primary WINS Server . . . . . . . : 10.91.0.16
Secondary WINS Server . . . . . . : 10.91.202.10

PPP adapter MYISP:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : WAN (PPP/SLIP) Interface
Physical Address. . . . . . . . . : 00-53-45-00-00-00
Dhcp Enabled. . . . . . . . . . . : No
IP Address. . . . . . . . . . . . : 10.148.8.82
Subnet Mask . . . . . . . . . . . : 255.255.255.255
Default Gateway . . . . . . . . . : 10.148.8.82
DNS Servers . . . . . . . . . . . : 202.56.230.5
202.56.230.6

In DIALIP -> TCPIP Properties -> General Tab : Use dafault gateway on
network is CHECKED. If I uncheck this then I cannot access internet.

C:\>route print
=================================================
Active Routes:
Network Destination Netmask Gateway Interface
Metric
0.0.0.0 0.0.0.0 10.91.194.1 10.91.194.159 21
0.0.0.0 0.0.0.0 10.148.8.82 10.148.8.82 1
10.6.6.6 255.255.255.255 10.148.8.82 10.148.8.82 1
10.91.194.0 255.255.255.0 10.91.194.159 10.91.194.159 20
10.91.194.159 255.255.255.255 127.0.0.1 127.0.0.1 20
10.91.255.255 255.255.255.255 10.91.194.1 10.91.194.159 1
10.148.8.82 255.255.255.255 127.0.0.1 127.0.0.1 50
10.255.255.255 255.255.255.255 10.91.194.159 10.91.194.159 20
10.255.255.255 255.255.255.255 10.148.8.82 10.148.8.82 50
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 10.91.194.159 10.91.194.159 20
224.0.0.0 240.0.0.0 10.148.8.82 10.148.8.82 1
255.255.255.255 255.255.255.255 10.91.194.159 10.91.194.159 1
255.255.255.255 255.255.255.255 10.148.8.82 10.148.8.82 1
Default Gateway: 10.148.8.82
==================================================

In this scenario, PING doesnt work as DNS servers are inaccessible.
Please let me know any possible solution.

Thanks,
Davinder

Your computer's LAN IP address is in the 10.91.194.x subnet. The
LAN's DNS servers are in a different subnet: 10.91.0.x. Therefore,
the only way to communicate with them is through the default gateway.
However, when you dial into the ISP, the dial-up default gateway
overrides the LAN default gateway, preventing access to the LAN's DNS
servers.

Changing your computer's LAN subnet mask from 255.255.255.0 to
255.255.0.0 might fix everything, since all 10.91.x.x addresses
(including the DNS and WINS servers) would be in the same subnet as
your computer.

I strongly recommend consulting with your company's network
administrators before making any change yourself, for these reasons:

1. They're the ones who know how the network works and how it should
be configured.

2. They can tell you whether company policy allows making a dial-up
connection while connected to the LAN. That can be a security risk,
and some companies don't allow it.
--
Best Wishes,
Steve Winograd, MS-MVP (Windows Networking)

Please post any reply as a follow-up message in the news group
for everyone to see. I'm sorry, but I don't answer questions
addressed directly to me in E-mail or news groups.

Microsoft Most Valuable Professional Program
http://mvp.support.microsoft.com

 

[Guest]

This indeed solved the issue. Thank you again for the wonderful advice.