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Can you try this patch to sys/netinet/if_arp.c? Some time ago
I struggled to similar problem and this seems helped. 

On Tue, 20 Feb 2001, Michael Moll wrote:

> Hi!
> 
> I try to do a diskless install on a Netra T1 105. I already succeeded in
> getting the kernel booted, but I can't mount the root-fs via NFS.
> 
> The messages on the console:
> [...]
> root on hme0
> [...]
> mountroot: trying nfs...
> nfs_boot: trying RARP (and RPC/bootparam)
> revarp failed, error=51
> mountroot: trying ffs...
> no file system for hme0
> cannot mount root, error = 79
> 
> tcpdump gives the following output:
> 
> [...]
> 12:12:45.905745 eisregen.mp-intern.3548 > mp-scsi17.mp-intern.nfs: 104 read [|nfs] (ttl 4, id 0, len 132)
> 12:12:45.905819 mp-scsi17.mp-intern.nfs > eisregen.mp-intern.3548: reply ok 772 read REG 100755 ids 0/0 sz 4806886  [|nfs] (DF) (ttl 64, id 0, len 800)
> 
> -> Kernel load via NFS from the bootloader, then the kernel boots.
> 
> 12:13:00.542084 :: > ff02::1:ffc2:bfc: icmp6: neighbor sol: who has fe80::a00:20ff:fec2:bfc (len 24, hlim 255)
> 12:13:01.572602 fe80::a00:20ff:fec2:bfc > ff02::1:ffc2:bfc: HBH (padn)(rtalert: 0x0000) icmp6: multicast listener report max resp delay: 0 addr: ff02::1:ffc2:bfc [hlim 1] (len 32)
> 
> 12:13:02.825306 rarp who-is 10.10.30.209 tell 10.10.30.209
> 12:13:02.825649 rarp reply 10.10.30.209 at eisregen.mp-intern
> 
> -> the RARP request+reply is repeated several times but it seems it doesn't
> get accepted by the kernel.
> 
> Any hints?
> 
> Thanks in advance
> -- 
> Michael Moll
> e-mail : kvedulv@kvedulv.de
>   WWW  : http://www.kvedulv.de/
>   GSM  : +49 175 606 7861
> 

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