Re: [lwip-users] Lwip with two ethernet ports

[Eason]

Sorry, l have another questions.

My devices and IP setting as following:
========================================================
PC <----------> (eth1)[Device_1](eth0) <-------------> [Device_2]

/----------------device_1----------------/ 
//eth0 
ip: 192.168.191.220 
netmask: 255.255.255.0 
gw: 192.168.191.254 

//eth1 
ip: 192.168.190.101
netmask: 255.255.255.0 
gw: 192.168.190.254
/----------------device_1----------------/ 

/----------------device_2----------------/ 
ip: 192.168.191.199 
netmask: 255.255.255.0 
gw: 192.168.191.254 
/----------------device_2----------------/ 

/----------------PC----------------/ 
ip: 192.168.190.102
netmask: 255.255.255.0 
gw: 192.168.190.101 
/----------------PC----------------/ 

========================================================

I try to trace the packet flow, there are log messages I print:

ping 192.168.190.101
[ethernetif_input] netif ip=192.168.190.101
[ethernetif_input] netif gateway=192.168.190.254
[ip_input] inp ip=192.168.190.101
[ip_input] inp gateway=192.168.190.254
[ip_input] ICMP packet sent to icmp_input, gw(192.168.190.254)...

ping 192.168.191.220
[ethernetif_input] netif ip=192.168.190.101
[ethernetif_input] netif gateway=192.168.190.254
[ip_input] inp ip=192.168.191.220
[ip_input] inp gateway=*255.255.0.0*
[ip_input] ICMP packet sent to icmp_input, gw(*255.255.0.0*)...

The Problems are these two:
1. Why my PC pings eth1(192.168.190.101) is OK, but eth0(192.168.191.220) is
"request timeout"?

2. Why the packet's gateway that ping eth0 is changed in ip_input, is it the
reason of "request timeout"?

thanks



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