diff options
Diffstat (limited to 'pxelinux.asm')
| -rw-r--r-- | pxelinux.asm | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/pxelinux.asm b/pxelinux.asm index 337dcc6d..3becef28 100644 --- a/pxelinux.asm +++ b/pxelinux.asm @@ -42,7 +42,11 @@ TFTP_PORT equ htons(69) ; Default TFTP port PKT_RETRY equ 6 ; Packet transmit retry count PKT_TIMEOUT equ 12 ; Initial timeout, timer ticks @ 55 ms ; Desired TFTP block size -TFTP_LARGEBLK equ (1500-20-8-4) ; MTU 1500 - IP hdr - UDP hdr - TFTP hdr +; 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_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) TFTP_BLOCKSIZE equ (1 << TFTP_BLOCKSIZE_LG2) |