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Can not ping but can browse internet

By ai_satcom ·
Hi,

I have windows XP professional. I am using dial-up modem to connect to the internet. I have a NIC which is connected to hub. I connect to internet allright and I can browse the websites as well. But, on the same machine i am not able to ping the websites. I get "request time out". Though the name resolution works fine. But I am able to ping my self (127.0.0.1) and dynamic ip address which is assigned to me by the ISP.
I have also tried by making internet connection sharing(ICS), but ping didn't work.
Any help would be much appreciated.

Cheers!
Sameer

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by BFilmFan In reply to Can not ping but can brow ...

You are most likely using the ethernet interface to ping and not the dailup.

You stated that you have a hub. Do you have a local network setup? In the DNS on the local network, is there a root hint of forwarder to a DNS address outside of your network?

Does your system have a hard-coded IP address, or are you being assigned one via DHCP on your dialup?

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by ai_satcom In reply to

Hi..Thankx for the reply.

First of all, how can I know what interface I am using to ping. In my knowledge the entries in the routing table guides which destination ip-address is routed to which interface. Also, I read in MS KB articles that whenever we make a dial-up connection, the ip-address we get from the ISP becomes the default gateway for the machine.
I didn't understand your point "In the DNS on the local network, is there a root hint of forwarder to a DNS address outside of your network". How do I see this?
I dont have a real network. Its just my machine connected to hub (no other machine is connected to hub), so that I have a valid IP-Address on the ethernet.
A minute before, I tried even disabling the ethernet interface, and I had only one connection which is dialup, still I couldn't ping. I am so surprised with this behavior.
waiting to hear from you.

Cheers!
Sameer

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by BobHo In reply to Can not ping but can brow ...

My first assumption would be that nothing is wrong. Websites can be set up to not respond to pings. It's up to the owner or host.

For example, you can get to www.borland.com or www.microsoft.com but you cannot ping them. There is nothing wrong with this behavior.

Try pinging a know server that responds to pings. Here are a couple:

www.yahoo.com
68.142.226.38

or
www.whitehouse.gov
68.22.73.194

Try pinging by name and ip. Do they both work by both methods? If not, which one doesn't?

If you can browse the net then I don't think you have any problem with tcpip or dns. You're just pinging a non-responding server.

Cheers.

RW

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by ai_satcom In reply to

Hi,
Let me explains the situation again. The computer which does dial-up would act as a remote PC in our system. This system would send UDP messages to our hub on a static IP address via internet(static IP address got from NTL). We have got a GSM modem which acts as a software modem in the remote PC. Here the sim card is from vodafone. The modem settings are fine as I can dial-up and browse the site. I am wondering if the ping problem has anything to do with vodafone servers.
I also tried to ping my computer (another computer which is not connected to the one which does dial up), but it failed. My computer is connected to cable modem from NTL. I was just trying to simulate the end-to-end behavior as it would do in real scenario.
Any new ideas freinds.

Cheers!
Sameer

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by BobHo In reply to Can not ping but can brow ...

GSM is a little different beast. It is know for having a very high latency. Since you are getting a timeout it simply means that the response did not come back in the expected time. To get a response back you will probably need to increase the ttl to an appropriate value for your modem. This information should be in your modem documentation.

Since you can get to the websites and browse them the problem isn't in your tcpip setup as I stated earlier. The problem is in your expected ping response time. If you put scanner on your connection you'll probably see a high rate of traffic with alot of lost packets. This simply means that you have alot of overhead for that type of connection.

Cheers.

RW

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by moonlightdriver2004 In reply to Can not ping but can brow ...

if ur using win XP service pack 2 chk out ur security settings!

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by OTL In reply to Can not ping but can brow ...

May want to check your firewall settings and XP's settings, ping may not have authority to access the internet.

BTW - Tracert gives a better indication of where the problem is, between which 2 servers/IP's.

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