[U-Boot-Users] Suspect behaiviour if gatewayip not set

Robin Gilks robin.gilks at tait.co.nz
Wed Dec 22 21:53:20 CET 2004


Having played with netconsole a bit, I've observed that the current 
behaiviour of warning if gatewayip is not set and then using its value 
of zero when talking to outside the current subnet is somewhat suspect.

The particular case of netconsole means that no error message is evident 
- it is trying to be sent the error down the ethernet connection that is 
being initiated with an arp(!

I propose that the warning message stay but the target address is put 
into the arp so that a proxying router can reply to it rather then send 
out a nonsense arp request.

* Patch by Robin Gilks 23 December 2004
         net.c - if gatewayip not set send arp request for destination 
IP not zero

--- net.c.old   2004-10-26 12:46:58.000000000 +1300
+++ net.c       2004-12-23 09:42:46.000000000 +1300
@@ -207,8 +207,10 @@
             (NetOurIP & NetOurSubnetMask)) {
                 if (NetOurGatewayIP == 0) {
                         puts ("## Warning: gatewayip needed but not 
+                       NetArpWaitReplyIP = NetArpWaitPacketIP;
+               } else {
+                       NetArpWaitReplyIP = NetOurGatewayIP;
-               NetArpWaitReplyIP = NetOurGatewayIP;
         } else {
                 NetArpWaitReplyIP = NetArpWaitPacketIP;

Robin Gilks
Senior Design Engineer          Phone: (+64)(3) 357 1569
Tait Electronics                Fax  :  (+64)(3) 359 4632
PO Box 1645 Christchurch        Email : robin.gilks at tait.co.nz
New Zealand

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