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How come IPConfig /flushdns doesn't work??....

Guest Penang

By Guest Penang
in Windows 98

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Guest Penang

Guest Penang

Posted
Posted

Hi, all !

 

I've tested IPConfig /flushdns command and found out that it doesn't

work. But before I go on, here are some background details...

 

My connection to the net is via ADSL, dynamic link. In theory, the use

of the following 3 commands:-

 

ipconfig /flushdns

ipconfig /release

ipconfig /renew

 

supposed to flush out the "old" dns, and obtain a "new" one.

 

So I made a batch file (ip.bat) with the following command:-

 

ipconfig /flushdns

ipconfig /release

ipconfig /renew

ipconfig /all

 

and run 2 tests, about 20 minutes apart.

 

The result is, the dns and the IPs stayed the same !!

 

The IP for test #1 is 118.101.50.219, so is test #2 !

 

I wonder if I have done something wrong. If I do, please tell me.

 

Thank you !

 

 

= = = = =============================================

 

 

Here are the complete test results: ----

 

Test #1:

 

D:\>ipconfig/flushdns

 

Windows IP Configuration

Successfully flushed the DNS Resolver Cache.

 

D:\>ipconfig/release

 

Windows IP Configuration

 

 

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :

IP Address. . . . . . . . . . . . : 0.0.0.0

Subnet Mask . . . . . . . . . . . : 0.0.0.0

Default Gateway . . . . . . . . . :

 

PPP adapter {9552DD77-E324-4E85-B801-1C1B61CACEF1}:

Connection-specific DNS Suffix . :

IP Address. . . . . . . . . . . . : 118.101.50.219

Subnet Mask . . . . . . . . . . . : 255.255.255.255

Default Gateway . . . . . . . . . : 118.101.50.219

 

 

D:\>ipconfig/renew

 

Windows IP Configuration

 

Ethernet adapter Local Area Connection:

 

Connection-specific DNS Suffix . :

IP Address. . . . . . . . . . . . : 192.168.1.3

Subnet Mask . . . . . . . . . . . : 255.255.255.0

Default Gateway . . . . . . . . . : 192.168.1.1

 

PPP adapter {9552DD77-E324-4E85-B801-1C1B61CACEF1}:

Connection-specific DNS Suffix . :

IP Address. . . . . . . . . . . . : 118.101.50.219

Subnet Mask . . . . . . . . . . . : 255.255.255.255

Default Gateway . . . . . . . . . : 118.101.50.219

 

D:\>ipconfig/all

 

Windows IP Configuration

 

Host Name . . . . . . . . . . . . : MetalShaving

Primary Dns Suffix . . . . . . . :

Node Type . . . . . . . . . . . . : Unknown

IP Routing Enabled. . . . . . . . : No

WINS Proxy Enabled. . . . . . . . : No

 

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :

Description . . . . . . . . . . . : VIA Compatable Fast

Ethernet Adapter #2

Physical Address. . . . . . . . . : 00-E0-4D-32-CE-8F

Dhcp Enabled. . . . . . . . . . . : Yes

Autoconfiguration Enabled . . . . : Yes

IP Address. . . . . . . . . . . . : 192.168.1.3

Subnet Mask . . . . . . . . . . . : 255.255.255.0

Default Gateway . . . . . . . . . : 192.168.1.1

DHCP Server . . . . . . . . . . . : 192.168.1.1

DNS Servers . . . . . . . . . . . : 192.168.1.1

Lease Obtained. . . . . . . . . . : Wednesday, October 22,

2008 11:33:36 PM

Lease Expires . . . . . . . . . . : Friday, November 21,

2008 11:33:36 PM

 

PPP adapter {9552DD77-E324-4E85-B801-1C1B61CACEF1}:

Connection-specific DNS Suffix . :

Description . . . . . . . . . . . : WAN (PPP/SLIP) Interface

Physical Address. . . . . . . . . : 00-53-45-00-00-00

Dhcp Enabled. . . . . . . . . . . : No

IP Address. . . . . . . . . . . . : 118.101.50.219

Subnet Mask . . . . . . . . . . . : 255.255.255.255

Default Gateway . . . . . . . . . : 118.101.50.219

DNS Servers . . . . . . . . . . . : 202.188.0.133

202.188.1.5

 

 

Test #2:

 

 

D:\>ipconfig/flushdns

 

Windows IP Configuration

Successfully flushed the DNS Resolver Cache.

 

D:\>ipconfig/release

 

Windows IP Configuration

 

 

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :

IP Address. . . . . . . . . . . . : 0.0.0.0

Subnet Mask . . . . . . . . . . . : 0.0.0.0

Default Gateway . . . . . . . . . :

 

PPP adapter {9552DD77-E324-4E85-B801-1C1B61CACEF1}:

Connection-specific DNS Suffix . :

IP Address. . . . . . . . . . . . : 118.101.50.219

Subnet Mask . . . . . . . . . . . : 255.255.255.255

Default Gateway . . . . . . . . . : 118.101.50.219

 

 

D:\>ipconfig/renew

 

Windows IP Configuration

 

Ethernet adapter Local Area Connection:

 

Connection-specific DNS Suffix . :

IP Address. . . . . . . . . . . . : 192.168.1.3

Subnet Mask . . . . . . . . . . . : 255.255.255.0

Default Gateway . . . . . . . . . : 192.168.1.1

 

PPP adapter {9552DD77-E324-4E85-B801-1C1B61CACEF1}:

Connection-specific DNS Suffix . :

IP Address. . . . . . . . . . . . : 118.101.50.219

Subnet Mask . . . . . . . . . . . : 255.255.255.255

Default Gateway . . . . . . . . . : 118.101.50.219

 

D:\>ipconfig/all

 

Windows IP Configuration

 

Host Name . . . . . . . . . . . . : MetalShaving

Primary Dns Suffix . . . . . . . :

Node Type . . . . . . . . . . . . : Unknown

IP Routing Enabled. . . . . . . . : No

WINS Proxy Enabled. . . . . . . . : No

 

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :

Description . . . . . . . . . . . : VIA Compatable Fast

Ethernet Adapter #2

Physical Address. . . . . . . . . : 00-E0-4D-32-CE-8F

Dhcp Enabled. . . . . . . . . . . : Yes

Autoconfiguration Enabled . . . . : Yes

IP Address. . . . . . . . . . . . : 192.168.1.3

Subnet Mask . . . . . . . . . . . : 255.255.255.0

Default Gateway . . . . . . . . . : 192.168.1.1

DHCP Server . . . . . . . . . . . : 192.168.1.1

DNS Servers . . . . . . . . . . . : 192.168.1.1

Lease Obtained. . . . . . . . . . : Wednesday, October 22,

2008 11:58:36 PM

Lease Expires . . . . . . . . . . : Friday, November 21,

2008 11:58:36 PM

 

PPP adapter {9552DD77-E324-4E85-B801-1C1B61CACEF1}:

Connection-specific DNS Suffix . :

Description . . . . . . . . . . . : WAN (PPP/SLIP) Interface

Physical Address. . . . . . . . . : 00-53-45-00-00-00

Dhcp Enabled. . . . . . . . . . . : No

IP Address. . . . . . . . . . . . : 118.101.50.219

Subnet Mask . . . . . . . . . . . : 255.255.255.255

Default Gateway . . . . . . . . . : 118.101.50.219

DNS Servers . . . . . . . . . . . : 202.188.0.133

202.188.1.5

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Guest MEB

Guest MEB

Posted
Posted

Re: How come IPConfig /flushdns doesn't work??....

 

"Penang" <kalambong@gmail.com> wrote in message

news:bbdc21c9-126b-4da5-b4fd-8e286afe0817@t39g2000prh.googlegroups.com...

| Hi, all !

|

| I've tested IPConfig /flushdns command and found out that it doesn't

| work. But before I go on, here are some background details...

|

|My connection to the net is via ADSL, dynamic link. In theory, the use

|of the following 3 commands:-

|***IP config info cut****

 

So what's your problem? And why all these cross-posts....

 

*You* obtain your IP and other from the modem/router when dynamic.

Want a new address? Physically power down [disconnect from power for about

20 minutes] the modem/router though its likely assigned via your provider

and hard set when initially installed [they have to know who you are after

all].

*IF* you received software with the ADSL modem you may be able to adjust the

*local IP ranges* .... you must contact your provider if you want to change

the ADSL IP/device ID.

 

--

MEB

http://peoplescounsel.org

a Peoples' counsel

_ _

~~

Guest ZÿRiX

Guest ZÿRiX

Posted
Posted

Re: How come IPConfig /flushdns doesn't work??....

 

1. release before flush

2. you are still connected the same device so you will pick up

the same ip as it has a lease time to it...

Devices that have not been changed almost always keep the same ip

Example...you have cable internet and you shut down your computer

and restart it most likely you will have the same ip but change the

network card and the mac address changes so the modem will

see a NEW device and the ip will change...

Same works for changing routers.....

 

Create a batch with this just copy and paste

 

 

@echo off

 

ipconfig /release

pause

ipconfig /flushdns

pause

ipconfig /renew

pause

ipconfig /all

 

 

 

 

--

ZÿRiX

(¯`'..(<>..<>)..'´¯)

Guest Sinner

Guest Sinner

Posted
Posted

Re: How come IPConfig /flushdns doesn't work??....

 

 

"MEB" <meb@not here@hotmail.com> wrote in message news:ugNRXRONJHA.5696@TK2MSFTNGP03.phx.gbl...

>

> *You* obtain your IP and other from the modem/router when dynamic.

> Want a new address? Physically power down [disconnect from power for about

> 20 minutes] the modem/router though its likely assigned via your provider

> and hard set when initially installed [they have to know who you are after

> all].

> *IF* you received software with the ADSL modem you may be able to adjust the

> *local IP ranges* .... you must contact your provider if you want to change

> the ADSL IP/device ID.

>

 

My former service provider, a cable service, told me my IP was dynamic also. In fact, they have a finite number of IP addresses, and for me to get a new one, I'd have to power down for at least 3 days. Anything less, and I'd just be reassigned the same address when I logged back on.

 

My current provider, Bellsouth FastAccess, has provides me with a Static IP. It's great if you want to self-host a website, FTP server, etc., but it sucks if your IP has been banned by several forums. For that, they invented the Proxy Server.

Guest ZÿRiX

Guest ZÿRiX

Posted
Posted

Re: How come IPConfig /flushdns doesn't work??....

 

 

My former service provider, a cable service, told me my IP was dynamic also.

In fact, they have a finite number of IP addresses, and for me to get a new

one, I'd have to power down for at least 3 days. Anything less, and I'd

just be reassigned the same address when I logged back on.

 

 

 

With cable change your router or change the mac in the router and it will

change your IP most times...

 

 

 

--

ZÿRiX

(¯`'..(<>..<>)..'´¯)

Guest Jack \(MVP-Networking\).

Guest Jack \(MVP-Networking\).

Posted
Posted

Re: How come IPConfig /flushdns doesn't work??....

 

Hi

Dynamic IP from the ISP does not imply that every time you log On or Off the

IP would change.

It means that you are Not entrusted with one specific IP, but the schedule

of the dynamic changes are up to the ISP's server.

Some ISP's IPs do not change for weeks even if you disconnect the modem from

the line, and reconnect after few days.

BTW, flushdns is a local command and does not affect the Internet connection

per-se.

Jack (MS, MVP-Networking)

 

 

"Penang" <kalambong@gmail.com> wrote in message

news:bbdc21c9-126b-4da5-b4fd-8e286afe0817@t39g2000prh.googlegroups.com...

> Hi, all !

>

> I've tested IPConfig /flushdns command and found out that it doesn't

> work. But before I go on, here are some background details...

>

> My connection to the net is via ADSL, dynamic link. In theory, the use

> of the following 3 commands:-

>

> ipconfig /flushdns

> ipconfig /release

> ipconfig /renew

>

> supposed to flush out the "old" dns, and obtain a "new" one.

>

> So I made a batch file (ip.bat) with the following command:-

>

> ipconfig /flushdns

> ipconfig /release

> ipconfig /renew

> ipconfig /all

>

> and run 2 tests, about 20 minutes apart.

>

> The result is, the dns and the IPs stayed the same !!

>

> The IP for test #1 is 118.101.50.219, so is test #2 !

>

> I wonder if I have done something wrong. If I do, please tell me.

>

> Thank you !

>

>

> = = = = =============================================

>

>

> Here are the complete test results: ----

>

> Test #1:

>

> D:\>ipconfig/flushdns

>

> Windows IP Configuration

> Successfully flushed the DNS Resolver Cache.

>

> D:\>ipconfig/release

>

> Windows IP Configuration

>

>

> Ethernet adapter Local Area Connection:

> Connection-specific DNS Suffix . :

> IP Address. . . . . . . . . . . . : 0.0.0.0

> Subnet Mask . . . . . . . . . . . : 0.0.0.0

> Default Gateway . . . . . . . . . :

>

> PPP adapter {9552DD77-E324-4E85-B801-1C1B61CACEF1}:

> Connection-specific DNS Suffix . :

> IP Address. . . . . . . . . . . . : 118.101.50.219

> Subnet Mask . . . . . . . . . . . : 255.255.255.255

> Default Gateway . . . . . . . . . : 118.101.50.219

>

>

> D:\>ipconfig/renew

>

> Windows IP Configuration

>

> Ethernet adapter Local Area Connection:

>

> Connection-specific DNS Suffix . :

> IP Address. . . . . . . . . . . . : 192.168.1.3

> Subnet Mask . . . . . . . . . . . : 255.255.255.0

> Default Gateway . . . . . . . . . : 192.168.1.1

>

> PPP adapter {9552DD77-E324-4E85-B801-1C1B61CACEF1}:

> Connection-specific DNS Suffix . :

> IP Address. . . . . . . . . . . . : 118.101.50.219

> Subnet Mask . . . . . . . . . . . : 255.255.255.255

> Default Gateway . . . . . . . . . : 118.101.50.219

>

> D:\>ipconfig/all

>

> Windows IP Configuration

>

> Host Name . . . . . . . . . . . . : MetalShaving

> Primary Dns Suffix . . . . . . . :

> Node Type . . . . . . . . . . . . : Unknown

> IP Routing Enabled. . . . . . . . : No

> WINS Proxy Enabled. . . . . . . . : No

>

> Ethernet adapter Local Area Connection:

> Connection-specific DNS Suffix . :

> Description . . . . . . . . . . . : VIA Compatable Fast

> Ethernet Adapter #2

> Physical Address. . . . . . . . . : 00-E0-4D-32-CE-8F

> Dhcp Enabled. . . . . . . . . . . : Yes

> Autoconfiguration Enabled . . . . : Yes

> IP Address. . . . . . . . . . . . : 192.168.1.3

> Subnet Mask . . . . . . . . . . . : 255.255.255.0

> Default Gateway . . . . . . . . . : 192.168.1.1

> DHCP Server . . . . . . . . . . . : 192.168.1.1

> DNS Servers . . . . . . . . . . . : 192.168.1.1

> Lease Obtained. . . . . . . . . . : Wednesday, October 22,

> 2008 11:33:36 PM

> Lease Expires . . . . . . . . . . : Friday, November 21,

> 2008 11:33:36 PM

>

> PPP adapter {9552DD77-E324-4E85-B801-1C1B61CACEF1}:

> Connection-specific DNS Suffix . :

> Description . . . . . . . . . . . : WAN (PPP/SLIP) Interface

> Physical Address. . . . . . . . . : 00-53-45-00-00-00

> Dhcp Enabled. . . . . . . . . . . : No

> IP Address. . . . . . . . . . . . : 118.101.50.219

> Subnet Mask . . . . . . . . . . . : 255.255.255.255

> Default Gateway . . . . . . . . . : 118.101.50.219

> DNS Servers . . . . . . . . . . . : 202.188.0.133

> 202.188.1.5

>

>

> Test #2:

>

>

> D:\>ipconfig/flushdns

>

> Windows IP Configuration

> Successfully flushed the DNS Resolver Cache.

>

> D:\>ipconfig/release

>

> Windows IP Configuration

>

>

> Ethernet adapter Local Area Connection:

> Connection-specific DNS Suffix . :

> IP Address. . . . . . . . . . . . : 0.0.0.0

> Subnet Mask . . . . . . . . . . . : 0.0.0.0

> Default Gateway . . . . . . . . . :

>

> PPP adapter {9552DD77-E324-4E85-B801-1C1B61CACEF1}:

> Connection-specific DNS Suffix . :

> IP Address. . . . . . . . . . . . : 118.101.50.219

> Subnet Mask . . . . . . . . . . . : 255.255.255.255

> Default Gateway . . . . . . . . . : 118.101.50.219

>

>

> D:\>ipconfig/renew

>

> Windows IP Configuration

>

> Ethernet adapter Local Area Connection:

>

> Connection-specific DNS Suffix . :

> IP Address. . . . . . . . . . . . : 192.168.1.3

> Subnet Mask . . . . . . . . . . . : 255.255.255.0

> Default Gateway . . . . . . . . . : 192.168.1.1

>

> PPP adapter {9552DD77-E324-4E85-B801-1C1B61CACEF1}:

> Connection-specific DNS Suffix . :

> IP Address. . . . . . . . . . . . : 118.101.50.219

> Subnet Mask . . . . . . . . . . . : 255.255.255.255

> Default Gateway . . . . . . . . . : 118.101.50.219

>

> D:\>ipconfig/all

>

> Windows IP Configuration

>

> Host Name . . . . . . . . . . . . : MetalShaving

> Primary Dns Suffix . . . . . . . :

> Node Type . . . . . . . . . . . . : Unknown

> IP Routing Enabled. . . . . . . . : No

> WINS Proxy Enabled. . . . . . . . : No

>

> Ethernet adapter Local Area Connection:

> Connection-specific DNS Suffix . :

> Description . . . . . . . . . . . : VIA Compatable Fast

> Ethernet Adapter #2

> Physical Address. . . . . . . . . : 00-E0-4D-32-CE-8F

> Dhcp Enabled. . . . . . . . . . . : Yes

> Autoconfiguration Enabled . . . . : Yes

> IP Address. . . . . . . . . . . . : 192.168.1.3

> Subnet Mask . . . . . . . . . . . : 255.255.255.0

> Default Gateway . . . . . . . . . : 192.168.1.1

> DHCP Server . . . . . . . . . . . : 192.168.1.1

> DNS Servers . . . . . . . . . . . : 192.168.1.1

> Lease Obtained. . . . . . . . . . : Wednesday, October 22,

> 2008 11:58:36 PM

> Lease Expires . . . . . . . . . . : Friday, November 21,

> 2008 11:58:36 PM

>

> PPP adapter {9552DD77-E324-4E85-B801-1C1B61CACEF1}:

> Connection-specific DNS Suffix . :

> Description . . . . . . . . . . . : WAN (PPP/SLIP) Interface

> Physical Address. . . . . . . . . : 00-53-45-00-00-00

> Dhcp Enabled. . . . . . . . . . . : No

> IP Address. . . . . . . . . . . . : 118.101.50.219

> Subnet Mask . . . . . . . . . . . : 255.255.255.255

> Default Gateway . . . . . . . . . : 118.101.50.219

> DNS Servers . . . . . . . . . . . : 202.188.0.133

> 202.188.1.5

Guest John Wunderlich

Guest John Wunderlich

Posted
Posted

Re: How come IPConfig /flushdns doesn't work??....

 

Penang <kalambong@gmail.com> wrote in news:bbdc21c9-126b-4da5-b4fd-

8e286afe0817@t39g2000prh.googlegroups.com:

> I've tested IPConfig /flushdns command and found out that it doesn't

> work. But before I go on, here are some background details...

>

>

 

You have a misunderstanding on how "flushdns" works. When connecting

to a site, a DNS lookup is made to find the IP address of that site.

After obtaining this information, that result is cached in a local

memory so that if you need to look up the same address in the near

future, you have it locally and don't have to go out to the DNS server

to look it up again.

 

Flushdns simply clears out this local DNS cache and forces the next

lookup to go to the DNS server to get its answer. You can't tell if it

worked by doing an "ipconfig" command.

 

-- John

Guest Bruce Chambers

Guest Bruce Chambers

Posted
Posted

Re: How come IPConfig /flushdns doesn't work??....

 

Penang wrote:

> Hi, all !

>

> I've tested IPConfig /flushdns command and found out that it doesn't

> work. But before I go on, here are some background details...

>

> My connection to the net is via ADSL, dynamic link. In theory, the use

> of the following 3 commands:-

>

> ipconfig /flushdns

> ipconfig /release

> ipconfig /renew

>

> supposed to flush out the "old" dns, and obtain a "new" one.

>

> So I made a batch file (ip.bat) with the following command:-

>

> ipconfig /flushdns

> ipconfig /release

> ipconfig /renew

> ipconfig /all

>

> and run 2 tests, about 20 minutes apart.

>

> The result is, the dns and the IPs stayed the same !!

>

> The IP for test #1 is 118.101.50.219, so is test #2 !

>

> I wonder if I have done something wrong. If I do, please tell me.

>

 

 

If you want to ensure a new IP Address (with which the "\flushdns"

switch has *nothing* to do) you'll need to reboot the computer after

using the "/release" command. (It's also normal practice to reboot

after using the "\flushdns" command, as well.)

 

 

--

 

Bruce Chambers

 

Help us help you:

http://www.catb.org/~esr/faqs/smart-questions.html

 

http://support.microsoft.com/default.aspx/kb/555375

 

They that can give up essential liberty to obtain a little temporary

safety deserve neither liberty nor safety. ~Benjamin Franklin

 

Many people would rather die than think; in fact, most do. ~Bertrand Russell

 

The philosopher has never killed any priests, whereas the priest has

killed a great many philosophers.

~ Denis Diderot

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