[Winpcap-users] Ping works only when ethereal is ON

Gianluca Varenni gianluca.varenni at cacetech.com
Mon Jul 7 15:55:15 GMT 2008

My bet is that your miniport is not managing OID_GEN_CURRENT_PACKET_FILTER 
correctly. When you start ethereal or any other winpcap based application 
and you use it in promiscuous mode, the WinPcap protocol driver sets the 

Do all the ICMP echo requests get "discarded" by the TCP/IP stack when 
ethereal is off, or just some of them?

Have a nice day

----- Original Message ----- 
From: "Sunil Dutt" <sunil.d at redpinesignals.com>
To: <winpcap-users at winpcap.org>
Sent: Wednesday, July 02, 2008 6:11 AM
Subject: [Winpcap-users] Ping works only when ethereal is ON

> Hi,
>  We are working on  USB based WinXP network WLAN station driver.
> We are facing an issue with the ICMP(the association to the AP is done).
> We do a ping request to the AP and also get the reply from the AP.We also 
> indicate the received reply to the TCP/IP stack but the successive pings 
> do not take place.
> The same happens when the ethereal(packet sniffer ) is on.
> When we close the sniffer the successive pings do not happen.
> We could not find any relation between indication of the received packet 
> to the TCP/IP stack and the ethereal.
> The firewall in the case of WINDOWS is TURNED OFF.
> Can anyone comment on this.
> Thanks in Advance
> sunil
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> Winpcap-users at winpcap.org
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