>Number:         4835
>Category:       bin
>Synopsis:       rarpd does not set the kernel arp tables correctly
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    bin-bug-people (Utility Bug People)
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Jan 17 00:35:00 1998
>Last-Modified:
>Originator:     Izumi Tsutsui
>Organization:
DTI
>Release:        1.3RELEASE
>Environment:
System: NetBSD mirage 1.3 NetBSD 1.3 (MIRAGE) #63: Fri Jan 9 17:39:14 JST 1998 tsutsui@mirage:/usr/src/sys/arch/i386/compile/MIRAGE i386

>Description:

On receiving a RARP request, rarpd also set the kernel arp tables,
but it does not set sdl_alen (link level addres length) so
the arp tables of booting hosts are incomplete.

>How-To-Repeat:

Set up hosts(5) and ethers(5) database and send RARP request to
the host from diskless client (I tried boot from sparc PROM monitor). 
After replying the request, the arp -a still shows client's
MAC address `incomplete'.

>Fix:

Add setting sdl_alen value in mkarp().

*** usr.sbin/rarpd/mkarp.c.orig Tue Nov 25 22:54:08 1997
--- usr.sbin/rarpd/mkarp.c      Sat Jan 17 16:18:26 1998
*************** mkarp(haddr, ipaddr)
*** 122,127 ****
--- 122,128 ----
  	while (p < endp) {
  		*p++ = *haddr++;
  	}
+ 	sdl_m.sdl_alen = 6;
  
  	rtm->rtm_flags = 0;
  
>Audit-Trail:
>Unformatted: