[Winpcap-users] RE: first ethernet pkt gobbled by the nextone...solved

Pedro Lucas netcount3 at clix.pt
Tue Apr 8 09:04:23 GMT 2008

It's not a standard sized frame per se, it's the maximum sized frame for 
transmission within IEEE 802.3. going beyond this limit would kill the 
compatibility with other standards like oldie Token Ring and newer 802.11.
There's a an addenda to the standard to allow 1522 to include the VLAN tag 
but that's it.
Several equipments allow oversized or jumbo frames, namely test equipments 
from Spirentcom, IXIA, using Gigabit adapters.
That depends on the network adapter and driver. If you're going to attempt 
it using a vanilla FastEther card, it won't work.
But Winpcap should be able to cope with it, at least I dont remember looking 
at frame limiting code inside.

----- Original Message ----- 
From: "Har Yash Bahadur" <har.bahadur at conexant.com>
To: "Har Yash Bahadur" <har.bahadur at conexant.com>; 
<winpcap-users at winpcap.org>
Sent: Tuesday, April 08, 2008 8:59 AM
Subject: [Winpcap-users] RE: first ethernet pkt gobbled by the 

> Hi All,
> I found that WinPcap is not able to send or receive Ethernet packets of 
> size >1514 bytes (inclusive of 14 byte MAC header). The packet lost was of 
> 1518 bytes which is the standard size in case of Ethernet packets. It 
> means the payload cannot be more than 1500 (=1514 - 14) bytes.
> I tried the same thing while sending a packet and I got an error from 
> function "pcap_sendpacket". When I reduced the total size to 1514 it works 
> fine!
> Anybody has any idea why this LIMIT? Ahs anybody else faced this issue?
> Regards,
> Har Yash

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