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lwip: disable ETHARP_TRUST_IP_MAC by default

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Disable ETHARP_TRUST_IP_MAC by default because:
1. The LAN peer may not be trustful
2. The LAN peer may has problem to update its ARP entry
This commit is contained in:
Liu Zhi Fu 2018-06-29 10:04:55 +08:00
parent 568da37af7
commit c84a2b9027
1 changed files with 12 additions and 1 deletions
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13
components/lwip/Kconfig
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@ -104,7 +104,7 @@ config LWIP_STATS
config LWIP_ETHARP_TRUST_IP_MAC
bool "Enable LWIP ARP trust"
default y
default n
help
Enabling this option allows ARP table to be updated.
@ -117,6 +117,17 @@ config LWIP_ETHARP_TRUST_IP_MAC
The peer *is* in the ARP table if it requested our address before.
Also notice that this slows down input processing of every IP packet!
There are two known issues in real application if this feature is enabled:
- The LAN peer may have bug to update the ARP table after the ARP entry is aged out.
If the ARP entry on the LAN peer is aged out but failed to be updated, all IP packets
sent from LWIP to the LAN peer will be dropped by LAN peer.
- The LAN peer may not be trustful, the LAN peer may send IP packets to LWIP with
two different MACs, but the same IP address. If this happens, the LWIP has problem
to receive IP packets from LAN peer.
So the recommendation is to disable this option.
Here the LAN peer means the other side to which the ESP station or soft-AP is connected.
config TCPIP_RECVMBOX_SIZE
int "TCPIP task receive mail box size"
default 32