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howto:pcap [2010/10/22 20:09] mcb30 |
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| If you are running iPXE inside a virtual machine, then you can intercept all network traffic to and from iPXE by running Wireshark on the host machine, without needing to set up a separate interceptor machine. | If you are running iPXE inside a virtual machine, then you can intercept all network traffic to and from iPXE by running Wireshark on the host machine, without needing to set up a separate interceptor machine. | ||
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| + | ==== Intercepting using port mirroring ==== | ||
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| + | If you have a switch that supports port mirroring, then you can intercept all network traffic to and from iPXE by running Wireshark on an interface attached to a port that mirrors the port attached to the iPXE machine, without needing to set up a separate interceptor machine. | ||
| ==== Capturing without intercepton ==== | ==== Capturing without intercepton ==== | ||
| - | If you are unable to intercept network traffic, then you should run Wireshark on the machine that handles the functionality that you are trying to troubleshoot. For example, if the problem is that iPXE is failing to acquire an address from your DHCP server, then you should install and run Wireshark on your DHCP server. If the problem is that iPXE is successfully acquiring an address from DHCP but is then failing to boot from your iSCSI target, then you should install and run Wireshark on your iSCSI target. It may not always be practical to install Wireshark on the relevant machine. | + | If you are unable to intercept network traffic, then you should run Wireshark on the machine that handles the functionality that you are trying to troubleshoot. For example, if the problem is that iPXE is failing to acquire an address from your DHCP server, then you should install and run Wireshark on your DHCP server. If the problem is that iPXE is successfully acquiring an address from DHCP but is then failing to boot from your iSCSI target, then you should install and run Wireshark on your iSCSI target. It may not always be practical to install Wireshark on the relevant machine, and this method may not capture all the required packets. |
| ===== Using your capture file ===== | ===== Using your capture file ===== | ||
