Arty A7 LWIP Echo Server network interface stops working after a few seconds

[jmckinney]

I'm running on an Arty A7 100T, using vivido/vitis 2022.1 trying to run the Microblaze/DDR/Ethernet Echo Server example. If I program the Arty via the run command in vitis, the echo server works for like 5 seconds, and then stops.

I set up a ping to it's IP address, and I see the Ping replies for a few seconds and then it changes to "Destination host Unreachable." I added a printf to the main loop that prints a "." Watching the Console I see this:

-----lwIP TCP echo server ------
TCP packets sent to port 6001 will be echoed back
XEMacLite detect_phy: PHY detected at address 1.
XEMacLite detect_phy: PHY detected.
link speed: 100
netif: added interface xe IP addr 0.0.0.0 netmask 0.0.0.0 gw 0.0.0.0
                    netif: setting default interface xe
                       DHCP Timeout
Configuring default IP of 10.48.30.104
Board IP: 10.48.30.104
Netmask : 255.255.255.0
Gateway : 10.48.30.1
Start Application
TCP echo server started @ port 7
...............................................................................
...............................................................................
...............................................................................
...............................................................................
netif: GW address of interface xe set to 10.48.30.255
                      netif_set_ipaddr: netif address being changed

  And the:

netif: GW address of interface xe set to 10.48.30.255
                      netif_set_ipaddr: netif address being changed

happens at right about the same time as the pings stop.

Has anyone experienced and defeated this problem?

 

[Ionel]

Do you have a dhcp or use static ip?
why 10.48.30.255 a broadcast address is used for GW?