Drop TFTP_MTU to 1440.

Drop TFTP_MTU to 1440.  This gives TFTP_LARGE_BLK = 1408 = 0x580, which
is the roundest number without dropping the MTU significantly below the
standard Ethernet MTU.

diff --git a/pxelinux.asm b/pxelinux.asm
index 3e50245..e8995eb 100644 (file)
--- a/pxelinux.asm
+++ b/pxelinux.asm
@@ -41,7 +41,7 @@ PKT_TIMEOUT   equ 12                  ; Initial timeout, timer ticks @ 55 ms
 ; For Ethernet MTU is normally 1500.  Unfortunately there seems to
 ; be a fair number of networks with "substandard" MTUs which break.
 ; The code assumes TFTP_LARGEBLK <= 2K.
-TFTP_MTU       equ 1472
+TFTP_MTU       equ 1440
 TFTP_LARGEBLK  equ (TFTP_MTU-20-8-4)   ; MTU - IP hdr - UDP hdr - TFTP hdr
 ; Standard TFTP block size
 TFTP_BLOCKSIZE_LG2 equ 9               ; log2(bytes/block)