From: Rich Glazier (RichGlazier@netscape.net)
Date: Thu Oct 30 2003 - 13:02:26 EST
I do not have routed or gated running.
RichGlazier@netscape.net (Rich Glazier) wrote:
>Tru64 Unix 5.1A PK4
>
>I have several entries in my route table with the "DM" flags. The gateway associated with these entries is as it sould be as specified in /etc/routes. All I can think is that at some point it couldn't get there via that route, and got redirected somewhere else. Here's the thing- there is no other path to that host bust via the route specified in /etc/routes, and nothing should have redirected it elsewhere. We do not have a redundant or "meshed" topology. That gateway wouldn't tell it to go somewhere else.
>
>Here are my questions:
>
>-In Unix, if a packet cant get to an IP via it's static or learned route, will it then always try the default gateway?
>
>-If the above scenario happened in our network, the default gateway would send it back telling it where to go. Presumably back to he dead path. Our default gateway wouldn't be able to get it there.
>
>-Would the above scenario constitute a modified redirect?
>
>- Is an "M" flag placed there by Unix, or is it sent from a netowrk device like the original ICMP redirect that adds the "D" flag?
>
>-What can cause a modified redirect? i.e what network devices can add the "M" to the route table.
>
>Example output:
>
>mars# netstat -rn | grep -E 'UGHD|default'
>default 10.1.101.254 UGS 6 467279 fta0
>10.5.150.24 10.1.101.253 UGHDM 1 36645 fta0
>10.6.50.2 10.1.101.253 UGHDM 0 44 fta0
>10.6.50.6 10.1.101.253 UGHDM 0 525 fta0
>10.8.50.5 10.1.101.253 UGHDM 1 8318 fta0
>mars# cat /etc/routes
>default 10.1.101.254
>-net 10.2 10.1.101.252
>-net 10.3 10.1.101.251
>-net 10.4 10.1.101.252
>-net 10.5 10.1.101.253
>-net 10.6 10.1.101.253
>-net 10.8 10.1.101.253
>-net 10.9 10.1.101.253
>-net 10.10 10.1.101.253
>-net 10.11 10.1.101.253
>-net 10.12 10.1.101.252
>-net 10.50 10.1.101.253
>-net 131.250 10.1.101.252
>-net 132.250 10.1.101.252
>-net 133.250 10.1.101.252
>-net 134.250 10.1.101.253
>-net 172.31.11 10.1.0.221
>
>P.S. the host IP machines have ben checked, and their networking and netmasks are ok.
>
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