Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!evax!bush From: bush@evax.arl.utexas.edu (Joe Bush) Newsgroups: comp.unix.ultrix Subject: routing table wierdness Message-ID: <1990Jul31.005036.17883@evax.arl.utexas.edu> Date: 31 Jul 90 00:50:36 GMT Organization: Computer Science Engineering Univ. of Texas at Arlington Lines: 110 Lately the routing tables on an MicroVAX 3900 running Ultrix 3.1 have started to include "host" information in the "destination" and "gateway" fields produced by the "netstat -r" command. For example, previously, the output from the "netstat -r" command returned only that information statically added by the "route" command (we are NOT running the notorious "routed"). That is, it returned the standard, "localhost" and "ethernet" destinations, as well as, a few REAL gateways (and the network destinations that could be reached from gateways). For example, here is the output from a VAXStation 3100 (running Ultrix 3.1) on the very same network that still behaves in the old familiar manner: ----------------------------------------------------------------------- Routing tables Destination Gateway Flags Refcnt Use Interface localhost localhost UH 0 3 lo0 eesun1-net eesun1 UG 0 0 se0 default uta1 UG 0 27 se0 csun5-net csun5 UG 0 0 se0 meap-net meap UG 0 0 se0 ethernet escro U 3 68619 se0 ----------------------------------------------------------------------- But for reasons I can't explain, the MicroVAX 3900 is suddenly loading up its routing tables with "host" info. None of the "hosts" (ie., those records where the destination and gateway field are the same and UGHD in the "Flags" field) are gateways. Here is a typical execution of "netstat -r" on the MicroVAX 3900: ----------------------------------------------------------------------- Routing tables Destination Gateway Flags Refcnt Use Interface localhost localhost UH 0 3 lo0 eesun1-net eesun1 UG 0 0 qe0 meap-net meap UG 0 0 qe0 default uta1 UG 1 115678 qe0 csun5-net csun5 UG 6 685680 qe0 ethernet evax U 0 4964 qe0 ksun ksun UGHD 0 5 qe0 mac-ii-rm314 mac-ii-rm314 UGHD 0 258 qe0 mac-ii-kamangar mac-ii-kamangar UGHD 0 860 qe0 escro escro UGHD 0 15566 qe0 mac-se-grabow mac-se-grabow UGHD 0 938 qe0 tandy-4k-rm118 tandy-4k-rm118 UGHD 0 2346 qe0 129.107.2.91 129.107.2.91 UGHD 0 24 qe0 129.107.2.27 129.107.2.27 UGHD 0 1970 qe0 utacfd utacfd UGHD 0 30 qe0 129.107.2.171 129.107.2.171 UGHD 1 2297 qe0 csun1 csun1 UGHD 0 1411 qe0 129.107.2.59 129.107.2.59 UGHD 0 2515 qe0 mac-se-kavi mac-se-kavi UGHD 0 4459 qe0 meap meap UGHD 0 7201 qe0 csejos csejos UGHD 0 1808 qe0 csun2 csun2 UGHD 0 11557 qe0 129.107.2.93 129.107.2.93 UGHD 0 444 qe0 mac-se-weems mac-se-weems UGHD 0 1623 qe0 csun4 csun4 UGHD 0 6432 qe0 eene eene UGHD 0 64 qe0 cracs1 cracs1 UGHD 0 1653 qe0 129.107.2.94 129.107.2.94 UGHD 0 993 qe0 agnos agnos UGHD 0 100 qe0 utat4 utat4 UGHD 0 1402 qe0 cracs2 cracs2 UGHD 0 2174 qe0 tandy-3k-muths tandy-3k-muths UGHD 0 1089 qe0 thingol thingol UGHD 0 170 qe0 mac-se-umbaugh mac-se-umbaugh UGHD 0 3989 qe0 ------------------------------------------------------------------------ I can find no reason to explain why the MicroVAX is suddenly including all this host information in its routing tables (ie., the records with the UGHD value flags field). Both machines have their "routed" turned off, use /etc/rc.local "static" routing, and the same broadcast and netmask values. In addition, each machine has only one ethernet interface (ie., does not serve as a gateway). Also curious is the response time to the "netstat -r" command on the MicroVAX. It used to take just a second to return (as the VAXstation still does) but now takes over two minutes to return, essentially independent system load. Can any one hassard a guess as to what might be causing this strange phemonena? In addition, why would routing tables *ever* want to include "host" info in this manner? Note that when the route tables are flushed with a "route -f" the "host" data returns in after 5-10 minutes under normal work loads. - Joe -- bush@evax.arl.utexas.edu Vax Systems Manager (817) 273 - 3333 CSE Dept. UT-Arlington Office Rm 221 EB2 403 South Cooper P.O. Box 19015 Arlington, Texas 76019