Re: [lwip-users] Simulation of TCP connections with multiple source IP addresses

[leena]

Hi Jonathan,

Thanks for the response. Can I have a look at some sample code which does
similar to what I am trying to do?

Thansk and Regards,
Leena M.

Quoting Jonathan Larmour <address@hidden>:

> Leena Mokadam wrote:
> > Hello,
> > 
> > I am a LWIP's new user. My query is about TCP connection with mutiple
> source
> > IPs.
> > 
> > Can we maintain (send/receive) multiple network interfaces using LWIP? I
> > have to simulate multiple IP addresses for the same PC and send/receive
> TCP
> > data with multiple IP address. For example,
> > My PC needs to simulate following IP addresses
> > 192.168.20.120, 192.168.20.121, 192.168.20.122, 192.168.20.123,
> > 192.168.20.124 and 192.168.20.125. And my program needs to maintain a TCP
> > connection for all of these IP address to various different servers. It
> > involves sending and receiving of data. Please let me know if this is
> > possible woith the help of LWIP. I am not sure as I have yet not seen any
> > LWIP API which accepts source IP address and Destination IP address.
> 
> In the current code, lwIP's routing and interface structure is 
> intentionally simplified. You can have only one IP address for each 
> interface ("netif"). I _think_ lwip should allow you to do what you want 
> if you set up a netif for each IP address. When you need to send something 
> from a specific address, then you will need to call 
> bind()/netconn_bind()/tcp_bind() (depending on the interface you're using) 
> to set the local IP address to use for that connection.
> 
> If you need to set up a listening port, you will also need to have 
> multiple listeners - one bound to each IP address separately.
> 
> Jifl
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