Question

Help with AIX Routing Table

Asked by: sharthun

I have a few questons regarding the route table on AIX
1) How do I know which one are static routes and which ones are learned. I am assuming the ones with the /24 ot static
    ie: 10.5.3/24 165.154.67.69
2) What does UGc etc. mean under FLAGS
3) What is interface lo0
4) How do I find the default GW
5) if I change it does the server need to be rebooted for the change to take effect.
6) If I remove static routes does this also require a reboot.


Routing tables
Destination      Gateway           Flags   Refs     Use  If   PMTU Exp Groups

Route Tree for Protocol Family 2 (Internet):
default          172.16.1.1        UGc       0        0  en2     -   -      -  
10.2.0.0         10.2.0.100        UHSb      0        0  en0     -   -      -   =>
10.2/16          10.2.0.100        U         0        0  en0     -   -      -  
10.2.0.100       127.0.0.1         UGHS      0     5142  lo0     -   -      -  
10.2.255.255     10.2.0.100        UHSb      0        0  en0     -   -      -  
10.5.3/24        165.154.67.69     UGc       0        0  en0     -   -      -  
10.5.42/24       165.154.67.254    UGc       0        0  en0     -   -      -  
10.10.1.0        10.10.1.1         UHSb      0        0  en3     -   -      -   =>
10.10.1/24       10.10.1.1         U         0        1  en3     -   -      -  
10.10.1.1        127.0.0.1         UGHS      0        3  lo0     -   -      -  
10.10.1.255      10.10.1.1         UHSb      3    99803  en3     -   -      -  
10.10.2.0        10.10.2.1         UHSb      0        0  en1     -   -      -   =>
10.10.2/24       10.10.2.1         U         0        1  en1     -   -      -  
10.10.2.1        127.0.0.1         UGHS      0        3  lo0     -   -      -  
10.10.2.255      10.10.2.1         UHSb      2    99803  en1     -   -      -  
127/8            127.0.0.1         U        62  8380929  lo0     -   -      -  
165.154.67.0     165.154.67.23     UHSb      0        0  en0     -   -      -   =>
165.154.67/24    165.154.67.23     U       238 293281366  en0     -   -      -  
165.154.67.3     127.0.0.1         UGHS      0 23372311  lo0     -   -      -  
165.154.67.23    127.0.0.1         UGHS     44 34138004  lo0     -   -      -  
165.154.67.160   127.0.0.1         UGHS      1   245152  lo0     -   -      -  
165.154.67.171   127.0.0.1         UGHS      0        0  lo0     -   -      -  
165.154.67.255   165.154.67.23     UHSb      1    37932  en0     -   -      -  
165.154.86.255   172.16.1.1        UGHW      0        6  en2     -     1    -  
172.16.1.0       172.16.1.27       UHSb      0        0  en2     -   -      -   =>
172.16.1/24      172.16.1.27       U         3      117  en2     -   -      -  
172.16.1.27      127.0.0.1         UGHS      0        3  lo0     -   -      -  
172.16.1.255     172.16.1.27       UHSb      2   117644  en2     -   -      -  
172.16.2/24      165.154.67.254    UGc       0        0  en2     -   -      -  
192.167.61/24    165.154.67.202    UGc       0        0  en0     -   -      -  
192.168.0/24     165.154.67.202    UGc       0        0  en0     -   -      -  
192.168.15/24    165.154.67.20     UGc       0        0  en0     -   -      -  
192.168.15.103   165.154.67.20     UGHW      1        1  en0     -   -      -  
192.168.15.113   165.154.67.20     UGHW      1    25147  en0  1400   -      -  
192.168.15.123   165.154.67.20     UGHW      1     1546  en0  1400   -      -  
192.168.16/24    165.154.67.69     UGc       0        0  en0     -   -      -  
192.168.19/24    165.154.67.69     UGc       0        0  en0     -   -      -  
192.168.19.118   165.154.67.69     UGHW      2    92218  en0  1500   -      -  
192.168.19.136   165.154.67.69     UGHW      1   133583  en0  1500   -      -  
192.168.21/24    165.154.67.69     UGc       0        0  en0     -   -      -  
192.168.22/24    165.154.67.69     UGc       0        0  en0     -   -      -  
192.168.22.10    165.154.67.69     UGHW      1    57542  en0  1500   -      -  
192.168.22.75    165.154.67.69     UGHW      1    44320  en0  1500   -      -  
192.168.23/24    165.154.67.69     UGc       0        0  en0     -   -      -  
192.168.23.44    165.154.67.69     UGHW      1       70  en0  1500   -      -  
192.168.23.50    165.154.67.69     UGHW      2    27743  en0  1500   -      -  
192.168.25/24    165.154.67.69     UGc       0        0  en0     -   -      -  
192.168.34/24    165.154.67.69     UGc       0        0  en0     -   -      -  
192.168.50/24    165.154.67.202    UGc       0        0  en0     -   -      -  
192.168.50.10    165.154.67.202    UGHW      1       59  en0  1500   -      -  
192.168.55/24    165.154.67.69     UGc       0        0  en0     -   -      -  
192.168.60/24    165.154.67.202    UGc       0        0  en0     -   -      -  
192.168.61/24    165.154.67.202    UGc       0        0  en0     -   -      -  
192.168.71/24    165.154.67.69     UGc       0        0  en0     -   -      -  
192.168.72/24    165.154.67.202    UGc       0        0  en0     -   -      -  
192.168.72.225   165.154.67.202    UGHW      1     7397  en0  1500   -      -  
192.168.72.226   165.154.67.202    UGHW      1     3007  en0  1500   -      -  
192.168.73/24    165.154.67.202    UGc       0        0  en0     -   -      -  
192.168.75/24    165.154.67.254    UGc       0        0  en0     -   -      -  
192.168.76/24    165.154.67.202    UGc       0        0  en0     -   -      -  
192.168.77/24    165.154.67.202    UGc       0        0  en0     -   -      -  
192.168.79/24    165.154.67.69     UGc       0        0  en0     -   -      -  
192.168.80/24    165.154.67.254    UGc       0        0  en0     -   -      -  
192.168.82/24    165.154.67.202    UGc       0        0  en0     -   -      -  
192.168.82.13    165.154.67.202    UGHW      3 108531120  en0     -   -      -  
192.168.82.14    165.154.67.202    UGHW      1   375854  en0  1500   -      -  
192.168.82.16    165.154.67.202    UGHW      0      317  en0     -     1    -  
192.168.84/24    165.154.67.202    UGc       0        0  en0     -   -      -  
192.168.84.135   165.154.67.202    UGHW      1    52370  en0  1500   -      -  
192.168.86/24    165.154.67.69     UGc       0        0  en0     -   -      -  
192.168.86.225   165.154.67.69     UGHW      1     2948  en0  1500   -      -  
192.168.86.226   165.154.67.69     UGHW      1     1213  en0  1500   -      -  
192.168.86.227   165.154.67.69     UGHW      2     1396  en0  1500   -      -  
192.168.86.229   165.154.67.69     UGHW      1     5936  en0  1500   -      -  
192.168.86.230   165.154.67.69     UGHW      1      153  en0  1500   -      -  
192.168.86.232   165.154.67.69     UGHW      1     1126  en0  1500   -      -  
192.168.86.233   165.154.67.69     UGHW      1     3258  en0  1500   -      -  
192.168.86.239   165.154.67.69     UGHW      1      174  en0  1500   -      -  
192.168.90/24    165.154.67.69     UGc       0        0  en0     -   -      -  
192.168.250/24   165.154.67.69     UGc       0        0  en0     -   -      -  

Route Tree for Protocol Family 24 (Internet v6):
::1              ::1               UH        0        0  lo0 16896   -      -  

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Asked On
2006-01-31 at 07:25:07ID21716988
Tags

aix

,

routing

,

table

Topic

Unix Networking

Participating Experts
3
Points
500
Comments
4

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Answers

 

by: bimal_linuxPosted on 2006-01-31 at 21:05:36ID: 15840637

Hi Sharthun,

Answers follows: -

1. Default routes initilized from /etc/rc.net. this file will tell you the details:  (http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.doc/aixbman/commadmn/tcp_route.htm must be a helpful link)

2. UGc means:
U=> UP
G=> The route is to a gateway
c=>Access to this route creates a cloned route

Try man netstat for more details
3. lo0 us the loopback interface. (http://www.tldp.org/LDP/nag/node66.html  and http://en.wikipedia.org/wiki/Loopback has more detais)
4. netstat -rn|grep default    wiil tell you the default gateway

for 5 and 6, you have to restart network to get the effect of the changes

Bimal Mankara

 

by: harbor235Posted on 2006-02-01 at 05:49:50ID: 15843050

> How do I know which one are static routes and which ones are learned
If they are learned then you must be running a routing daemon, look for routed or gated (ps -aux| grep routed)

I agree with finding the static rooutes, they could also be in /etc/rc.local


harbor235 ;}

 

by: kamermansPosted on 2006-02-12 at 16:15:55ID: 15937574

The Default GW for the routing table is 172.16.1.1 because the destination field has 'default' in it - some systems may show '*' indicating the default route.  All routes that have 'S' in the 'Flags' field are static routes - they have been set using the route command (their are some exeptions to this).  Here are your static routes (the default GW is basically static so I include it too):

default          172.16.1.1        UGc       0        0  en2     -   -      -  
10.2.0.0         10.2.0.100        UHSb      0        0  en0     -   -      -   =>
10.2/16          10.2.0.100        U         0        0  en0     -   -      -  
10.2.0.100       127.0.0.1         UGHS      0     5142  lo0     -   -      -  
10.2.255.255     10.2.0.100        UHSb      0        0  en0     -   -      -  
10.5.3/24        165.154.67.69     UGc       0        0  en0     -   -      -  
10.5.42/24       165.154.67.254    UGc       0        0  en0     -   -      -  
10.10.1.0        10.10.1.1         UHSb      0        0  en3     -   -      -   =>
10.10.1/24       10.10.1.1         U         0        1  en3     -   -      -  
10.10.1.1        127.0.0.1         UGHS      0        3  lo0     -   -      -  
10.10.1.255      10.10.1.1         UHSb      3    99803  en3     -   -      -  
10.10.2.0        10.10.2.1         UHSb      0        0  en1     -   -      -   =>
10.10.2/24       10.10.2.1         U         0        1  en1     -   -      -  
10.10.2.1        127.0.0.1         UGHS      0        3  lo0     -   -      -  
10.10.2.255      10.10.2.1         UHSb      2    99803  en1     -   -      -  
127/8            127.0.0.1         U        62  8380929  lo0     -   -      -  
165.154.67.0     165.154.67.23     UHSb      0        0  en0     -   -      -   =>
165.154.67/24    165.154.67.23     U       238 293281366  en0     -   -      -  
165.154.67.3     127.0.0.1         UGHS      0 23372311  lo0     -   -      -  
165.154.67.23    127.0.0.1         UGHS     44 34138004  lo0     -   -      -  
165.154.67.160   127.0.0.1         UGHS      1   245152  lo0     -   -      -  
165.154.67.171   127.0.0.1         UGHS      0        0  lo0     -   -      -  
165.154.67.255   165.154.67.23     UHSb      1    37932  en0     -   -      -  
165.154.86.255   172.16.1.1        UGHW      0        6  en2     -     1    -  
172.16.1.0       172.16.1.27       UHSb      0        0  en2     -   -      -   =>
172.16.1/24      172.16.1.27       U         3      117  en2     -   -      -  
172.16.1.27      127.0.0.1         UGHS      0        3  lo0     -   -      -  
172.16.1.255     172.16.1.27       UHSb      2   117644  en2     -   -      -  

Here is a reference for you:
http://publib16.boulder.ibm.com/pseries/en_US/cmds/aixcmds4/netstat.htm#a234x93d2

 

by: sharthunPosted on 2006-02-14 at 12:21:52ID: 15954382

Thank you very much.

20120131-EE-VQP-002

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98% positive feedback on 31,087 answers since March 2000. angeliii is a Microsoft Most Valuable Professional for his work with MS SQL Server & Develoment.

He has also proven his knowledge of Visual Basic Programming, PHP Scripting and Oracle Databases.

The Experts

97% positive feedback on 10,752 answers since July 2000. lrmoore has more than 18 years experience in the networking industry.

The six-time Mircosoft MVPs specialties include firewalls, virtual private networking, and network management.

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