[Info-vax] Routing when using two interfaces/networks.

[VAXman- at SendSpamHere.ORG]

In article <hiv6ps$fk1$1 at news.albasani.net>, Jan-Erik Soderholm <jan-erik.soderholm at telia.com> writes:
>Hi.
>We have some hard-to-identify network problems at
>a site and I'm now thinking that it might have something
>to do with how the routing is setup in the VMS system.
>
>The VMS system (the "prod" system) has two interfaces :
>
>$ tcpip sh inter
>
>Interface   IP_Addr         Network mask
>
>  LO0        127.0.0.1       255.0.0.0
>  WE0        193.183.98.2    255.255.255.0
>  WE1        10.32.137.1     255.255.255.0
>
>
>The 193.183.x.x is the "old" network that will be removed
>anytime(tm). The 10.32.x.x network is where most of the other
>stuff (term-servers, PC-clients and so on) are. Note that
>most other equipment on 10.32.x.x are on other subnets then
>10.32.137.x. The only other host on the 10.32.137.x are mainly
>the other VMS systems. All "user" equipment are on other
>10.32.x.x networks.
>
>The current routing looks like this :
>
>$ tcpip sh route
>
>                        DYNAMIC
>
>Type           Destination                    Gateway
>
>AN    0.0.0.0                         193.183.98.251
>AN    10.32.137.0/24                  10.32.137.1
>AH    10.32.137.1                     10.32.137.1
>AH    127.0.0.1                       127.0.0.1
>AN    193.183.98.0/24                 193.183.98.2
>AH    193.183.98.2                    193.183.98.2
>st
>$ tcpip sh route/perm
>
>                        PERMANENT
>
>Type           Destination                    Gateway
>
>PN    0.0.0.0                         193.183.98.251
>
>
>The "dev" system has only one interface and looks like this :
>
>$ tcpip sho inter
>
>Interface   IP_Addr         Network mask
>
>  LO0        127.0.0.1       255.0.0.0
>  WE1        10.32.137.3     255.255.255.0
>
>$ tcpip sh rout
>
>                              DYNAMIC
>
>Type           Destination                   Gateway
>
>AN    0.0.0.0                          10.32.137.254
>AN    10.32.137.0/24                   10.32.137.3
>AH    10.32.137.3                      10.32.137.3
>AH    127.0.0.1                        127.0.0.1
>
>$ tcpip sh rout/perm
>
>                              PERMANENT
>
>Type           Destination                   Gateway
>
>PN    0.0.0.0                          10.32.137.254
>
>
>The "problems" we are seeing are e.g. :
>
>- Troubles ("hangs") when FTP copying from "prod" to "dev".
>- Intermittent slow access from PC clients.
>
>My guess is that the disturbances are due to the fact that all
>routing goes through the 193.183.98.251 gateway, even between
>different 10.32.x.x subnets, right ? And that the solution
>probably would be to simply move the default router from
>the 193.183.98.251 gateway to the 10.32.137.254 gateway on
>the system with two networks ?
>
>Jan-Erik.

Shouldn't your 10... network be routed 10.0.0.0/8 such that the internal
traffic to the other subnets is NOT routed through to the 193.183.98.251
gateway?

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