Re: Ethernet packet size python
K-man wrote: Hi, I am sending data using the socket interface in python, but I want to know how big the ethernet packet size is (in bytes). I didn't really see a way using the socket library of how to do this. Any suggestions? There is no way to know what size Ethernet packets will result from specific traffic. Or do you want to know the MTU size (largest possible Ethernet packet size)? This shouldn't really matter, since large TCP messages will be split into a sequence of IP datagrams, and large IP datagrams will be automatically fragmented and then reassembled at the other end. Is there a specific reason this is important to you? regards Steve -- Steve Holden+1 571 484 6266 +1 800 494 3119 Holden Web LLC http://www.holdenweb.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Ethernet packet size python
On Jan 13, 10:35 am, Steve Holden st...@holdenweb.com wrote: K-man wrote: Hi, I am sending data using the socket interface in python, but I want to know how big the ethernet packet size is (in bytes). I didn't really see a way using the socket library of how to do this. Any suggestions? There is no way to know what size Ethernet packets will result from specific traffic. Or do you want to know the MTU size (largest possible Ethernet packet size)? This shouldn't really matter, since large TCP messages will be split into a sequence of IP datagrams, and large IP datagrams will be automatically fragmented and then reassembled at the other end. Is there a specific reason this is important to you? regards Steve -- Steve Holden +1 571 484 6266 +1 800 494 3119 Holden Web LLC http://www.holdenweb.com/ I am trying to determine the actual network link speed. -- http://mail.python.org/mailman/listinfo/python-list
Re: Ethernet packet size python
On 2009-01-13, Steve Holden st...@holdenweb.com wrote: K-man wrote: I am sending data using the socket interface in python, but I want to know how big the ethernet packet size is (in bytes). I didn't really see a way using the socket library of how to do this. Any suggestions? There is no way to know what size Ethernet packets will result from specific traffic. Unless he's using a low level API such as AF_PACKET/SOCK_RAW. If that's the case then the packets will be exactly as big as he makes them. And he wouldn't be asking this question. :) Or do you want to know the MTU size (largest possible Ethernet packet size)? This shouldn't really matter, since large TCP messages will be split into a sequence of IP datagrams, and large IP datagrams will be automatically fragmented and then reassembled at the other end. Is there a specific reason this is important to you? If it's just idle curiosity, then wireshark or tcpdump can show one exactly what's going on on the wire. A reading of http://en.wikipedia.org/wiki/Transmission_Control_Protocol should also allow one to predict pretty accurately what's going to happen when you call send(). -- Grant Edwards grante Yow! I want EARS! I want at two ROUND BLACK EARS visi.comto make me feel warm 'n secure!! -- http://mail.python.org/mailman/listinfo/python-list
