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microudp: fix udp txlen

* the preample length 8 is already included in sizeof(struct
ethernet_header)
* the minimum packet size is 64, exluding fcs and including
preample it is 68 (the arp functions are correct)
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1 parent 69568ad commit 1a28690fa05ae821e2e8ba689292e37a0e6f3491 @jordens jordens committed with sbourdeauducq Nov 11, 2013
Showing with 2 additions and 2 deletions.
  1. +2 −2 software/libnet/microudp.c
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4 software/libnet/microudp.c
@@ -262,8 +262,8 @@ int microudp_send(unsigned short src_port, unsigned short dst_port, unsigned int
&& (cached_mac[3] == 0) && (cached_mac[4] == 0) && (cached_mac[5] == 0))
return 0;
- txlen = length + sizeof(struct ethernet_header) + sizeof(struct udp_frame) + 8;
- if(txlen < 72) txlen = 72;
+ txlen = length + sizeof(struct ethernet_header) + sizeof(struct udp_frame);
+ if(txlen < 68) txlen = 68;
fill_eth_header(&txbuffer->frame.eth_header,
cached_mac,

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