Is this the expected behaviour on Windows i. Or, shall we modify Scapy avoid this crash? The text was updated successfully, but these errors were encountered:. Scapy won't be able to send or sniff packets without Winpcap. However, it might still be useful to read PCAP files, dissect packets and play with them. So my guess is we should handle this crash and display a clear warning like when Crypto module is missing.
Sorry, something went wrong. Linked with: If that was answered with , maybe you can close it? Skip to content. A: No. Only physical interfaces are supported. This is a limitation of Windows and not of WinPcap. The source packages still include the code base for those operating systems, but the setup executable will refuse to install. The last versions supporting such operating systems are WinPcap 3.
PPP is not supported, and IPv6 addresses are not listed. We strongly suggest upgrading to WinPcap 4. A: Support for SMP machines has been included starting from version 3. Please update your installation of WinPcap. Q Which network adapters are supported by WinPcap? Support for other MACs was added during the development, but Ethernet remains the most tested one.
Wireless adapters : these adapters may present problems, because they are not properly supported by the Windows Kernel. Some of them are not detected, other don't support promiscuous mode.
In the best case, WinPcap is able to see an Ethernet emulation and not the real transiting packets: this means that the AirPcap at this time is the only solution for capturing raw More details can be found on the AirPcap product page. Q Can I use WinPcap to drop the incoming packets?
Is it possible to use WinPcap to build a firewall? WinPcap is implemented as a protocol, therefore it is able to capture the packets, but it can't be used to drop them before they reach the applications.
The filtering capabilities of WinPcap work only on the sniffed packets. Q Is it possible to start WinPcap automatically when the system boots? A: You can change the start settings of the NPF service to "automatic" or "system". This works only in Windows NTx. Q I recompiled the sources of WinPcap and the result doesn't seem to work as expected. A: If you used Microsoft Visual Studio 6, try to install the service pack 5 and compile again.
What's wrong? You have to uninstall ZxSniffer to make WinPcap working. Q My application doesn't see any traffic being sent by the machine running WinPcap.
A: If you are running some form of VPN client software, it might be causing this problem; people have seen this problem when they have Check Point's VPN software installed on their machine. If that's the cause of the problem, you will have to remove the VPN software in order to make the application see outgoing packets. Q When I use one of the WinPcap-based applications , why do I see only packets to or from my machine, or why do I not see all the traffic I'm expecting to see from or to the machine I'm trying to monitor?
A: This might be because the interface on which you're capturing is plugged into a switch; on a switched network, unicast traffic between two ports will not necessarily appear on other ports - only broadcast and multicast traffic will be sent to all ports.
Note that even if your machine is plugged into a hub, the "hub" may be a switched hub, in which case you're still on a switched network. Note also that on the Linksys Web site, they say that their auto-sensing hubs "broadcast the 10Mb packets to the port that operate at 10Mb only and broadcast the Mb packets to the ports that operate at Mb only", which would indicate that if you sniff on a 10Mb port, you will not see traffic coming sent to a Mb port, and vice versa.
This problem has also been reported for Netgear dual-speed hubs, and may exist for other "auto-sensing" or "dual-speed" hubs. Some switches have the ability to replicate all traffic on all ports to a single port so that you can plug your analyzer into that single port to sniff all traffic. You would have to check the documentation for the switch to see if this is possible and, if so, to see how to do this. See, for example:. If you have a box of that sort, that has a switch with some number of Ethernet ports into which you plug machines on your network, and another Ethernet port used to connect to a cable or DSL modem, you can, at least, sniff traffic between the machines on your network and the Internet by plugging the Ethernet port on the router going to the modem, the Ethernet port on the modem, and the machine on which you're running tcpdump into a hub make sure it's not a switching hub, and that, if it's a dual-speed hub, all three of those ports are running at the same speed.
If your machine is not plugged into a switched network or a dual-speed hub, or it is plugged into a switched network but the port is set up to have all traffic replicated to it, the problem might be that the network interface on which you're capturing doesn't support "promiscuous" mode, or because your OS can't put the interface into promiscuous mode. Normally, network interfaces supply to the host only:. Most network interfaces can also be put in "promiscuous" mode, in which they supply to the host all network packets they see.
Tcpdump will try to put the interface on which it's capturing into promiscuous mode unless the -p option was specified. However, some network interfaces don't support promiscuous mode, and some OSes might not allow interfaces to be put into promiscuous mode. If the interface is not running in promiscuous mode, it won't see any traffic that isn't intended to be seen by your machine. It will see broadcast packets, and multicast packets sent to a multicast MAC address the interface is set up to receive.
You should ask the vendor of your network interface whether it supports promiscuous mode. If it does, you should ask whoever supplied the driver for the interface the vendor, or the supplier of the OS you're running on your machine whether it supports promiscuous mode with that network interface. In the case of token ring interfaces, the drivers for some of them, on Windows, may require you to enable promiscuous mode in order to capture in promiscuous mode.
Ask the vendor of the card how to do this, or see, for example, this information on promiscuous mode on some Madge token ring adapters note that those cards can have promiscuous mode disabled permanently, in which case you can't enable it. This is the same WinPcap installer that you can get from WinPcap's download page. When was this page last modified? Home Overview Latest Changes. Overview Latest Changes. WinPcap Versions We strongly recommend that you use version 4.
Latest Stable Release: 4. Previous Stable Release: 3.
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