dns was changed at some point so that it could no longer
resolve any name starting with "target" through /net/dns, since all such
names were taken to be requests to change the limit to nodes in the cache.

Reference: /n/sources/patch/applied/dns-mistarget
Date: Thu Aug  7 11:07:25 CES 2008
Signed-off-by: forsyth@terzarima.net

--- /sys/src/cmd/ndb/dns.c	Thu Aug  7 11:05:20 2008
+++ /sys/src/cmd/ndb/dns.c	Thu Aug  7 11:05:15 2008
@@ -738,7 +738,7 @@
 	} else if(strcmp(job->request.data, "stats")==0){
 		dnstats("/lib/ndb/dnsstats");
 		goto send;
-	} else if(strncmp(job->request.data, "target", 6)==0){
+	} else if(strncmp(job->request.data, "target ", 7)==0){
 		target = atol(job->request.data + 6);
 		dnslog("target set to %ld", target);
 		goto send;