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List:       aix-l
Subject:    routing problem
From:       "Sippel, Christian" <Christian.Sippel () IZB ! DE>
Date:       2003-07-29 9:00:02
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Dear list,
I have the following routing problem:

An AIX 5.1-Box has 2 IP adresses in the same subnet,  172.16.125.121 and
172.16.125.123. Both are on the same adapter, en0, .121 als "real" adress,
.123 as an alias. I would like to send mails to an Exchange-Server with the
IP 1.4.13.29 which is behind a firewall. If I do for example a traceroute to
1.4.13.29 my box uses its .121-adress.

I tried the following
 route add -host 1.4.13.29 -interface 172.16.125.123

then netstat -rn tells me:

Routing tables
Destination      Gateway           Flags   Refs     Use  If   PMTU Exp
Groups

Route Tree for Protocol Family 2 (Internet):
default          172.16.125.97     UG       10  2347933  en0     -   -
1.4.13.29        172.16.125.123    UH        0       44  en0     -   -
127/8            127.0.0.1         U         7   828343  lo0     -   -
172.16.125.96/27 172.16.125.123    U         2  1889714  en0     -   -
172.16.125.121   127.0.0.1         UGHS      5    12027  lo0     -   -
172.16.125.123   127.0.0.1         UGHS      4    12036  lo0     -   -
172.16.125.128/25 172.16.125.143    U         7  1592778  en1     -   -
172.16.125.143   127.0.0.1         UGHS     42  2070163  lo0     -   -


a traceroute says

# traceroute 1.4.13.29
trying to get source for 1.4.13.29
source should be 172.16.125.123
traceroute to 1.4.13.29 (1.4.13.29) from 172.16.125.123 (172.16.125.123), 30
hops max
outgoing MTU = 1500
 1  * * *
 2  * * *
 3  * * *
 4  * * *
 5  *

but with iptrace I can see that my box doesn't send anything at all - it
behave as if it would miss a route. Also the Firewall-guys tell me nothing
is received by the firewall.

I'm guessing my box "thinks" it could reach the destination IP 1.4.13.29
via a local interface and then sends ARP-Requests for the 1.4.13.29 which
aren't forwarded by the firewall - but I'm not shure about what's going on.

So how can I tell my box if it wants to reach 1.4.13.29 to use it's
sender-IP .123 and the default gateway?

Any help is really appreciated, thanks a lot,

Christian
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