![]() #pcap filter expr " port 80 and (tcp & 0xf0) > 2):4] = 0x47455420 or tcp & 0xf0) > 2)+8:4] = 0x20323030)"Īlternatively, in the UI go to Maintenance > Service Information > Packet Captures and enter just the filter you want into the filter section (quotation marks are not needed). To use this on a ProxySG, either enter the command line entry as follows (take note to use quotation marks): Then select that interface and click the Start button. ![]() To do this quickly and simply, I would click Capture > Interfaces and confirm which interface is receiving packets. First thing I would confirm is that I am using the right interface. You can also add things like DNS by adding another port: tcp port 8080 is /capture/ filter, but tcp.port 8080 is /display/ filter. You could specify "304" or "500" by determining what the hex values for those items is. Instead of "GET " you could use the hex values for "HEAD" or "POST". The values can be changed by replacing with the data you want. By using the filter above, you can gather only GETs with valid, new content responses. This filter is very powerful on a very busy ProxySG, as sometimes there is enough data traversing the proxy to only capture a few seconds before hitting the 100 MB limit. A typical HTTP response will start with "HTTP/1.1 200 OK". The third bullet is offset by 8 bytes and is for an HTTP response. The second bullet restated says "TCP offset 47455420" which is literally "GET " (G, E, T, space) You have to decide whether to use a /capture/ filter or a /display/ filter - the syntax is different between those two filter types. Go back to Wireshark and stop the capture process. Once you are only capturing traffic from a single port, it is alot easier to tell who is sending/receiving each packet. This choice is under the capture->options menu in Wireshark. ![]() Open your command prompt and ping the address of your choice. You can set a capture filter to only display traffic from a specific tcp port, which you can point to the port where your IIS is running. Most common for a transparent HTTP environment. Open Wireshark and start the capturing process as described above. ![]() The first part is to only capture TCP or UDP port 80. The following information is taken in part from the Wireshark Wiki page on capturing HTTP GET requests ( /CaptureFilters). ![]()
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