sorry, I made a mistake, the tcpdump can capture the IP packet, but I don't know why the HTTP server (python -m SimpleHTTPServer) responds such an strange IP packet. when I use normal web browser to access it, it works fine.
On Tue, Oct 20, 2015 at 1:23 PM, liu wen <caonimagongl...@gmail.com> wrote: > Hi, all: > > > I run the following command lines to create a Virtual interface tun2 > sudo openvpn --mktun --dev tun2 > sudo ip link set tun2 up > sudo ip addr add 10.0.0.1/24 dev tun2 > > and I run a simple HTTP server on 10.0.0.1:8000 > > then I wrote a TCP program which transfer tcp packets from a web > browser to the HTTP server through the TUN interface(tun2). (so it sends > SYN to 10.0.0.1:8000, reads SYN_ACK and sends ACK and then sends HTTP > request ...) > > I read packets from tun2 and get an unexpected packet, which is of 72 > bytes and with a protocol number 255. The related info is as below: > > read_tun: read 72 bytes > iphdr->ip_p:255, ip packet length:72, iphdr->ip_hl:5 > > it is strange coz I use tcpdump to capture packets on tun2 and dont see > the packet from the captured files. > > so what is this packet? why is it here? > > >
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