Re: [lwip-users] IP_HDRINCL in ip_output_if()

[Jani Monoses]

Unlike the comment suggests it's not used at TCP retransmits but in ICMP
replies when the header of the ICMP request is reused and changes only a
little.

> Hello,
> 
> does someone remember when and why IP_HDRINCL is implemented in
> netif.c/ip_output_if()?
> 
> -----
> ip_output_if(struct pbuf *p, struct ip_addr *src, struct ip_addr
> *dest,
>              u8_t ttl, u8_t tos,
>              u8_t proto, struct netif *netif)
> {
>   static struct ip_hdr *iphdr;
>   static u16_t ip_id = 0;
> 
>   snmp_inc_ipoutrequests();
> 
>   if (dest != IP_HDRINCL) {
> -----
> 
> Regards, Leon.
> 
> 
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