Hi guys,
In my project, I set tcp mtu 9000 in vpp startup file: tcp { mtu 9000 }, and
set interfaces mtu 1500. When sending tcp packet, vlib_buffer_push_ip4 will add
'dont frag' flag for packet, if tcp data more then 1500 bytes, i will "ip4 MTU
exceeded and DF set" error.
always_inline void *
vlib_buffer_push_ip4 (vlib_main_t * vm, vlib_buffer_t * b,
ip4_address_t * src, ip4_address_t * dst, int proto,
u8 csum_offload)
{
return vlib_buffer_push_ip4_custom (vm, b, src, dst, proto, csum_offload,
1 /* is_df */ ); <----- why add df flag ?
}
if seting is_df flag to 0 in vlib_buffer_push_ip4, sending tcp data more then
1500 bytes will succeed.
Is there anyone know why vlib_buffer_push_ip4 not support fragmentation and
should set df flag for tcp?
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