Ping Problem

[hasanjan]

Hi all ,

I have a Intelli P275 and AIX 5.1.0.0 and
ent1 Available 1j-08 10/100/1000 Base-TX PCI-X Adapter (14106902)

Problem:

Sometime i can ping a remote host, and sometimes can´t ping the same remote host.


tracerout to remote hots:
trying to get source for 10.128.76.143
source should be 10.50.45.196
traceroute to 10.128.76.143 (10.128.76.143) from 10.50.45.196 (10.50.45.196), 30 hops max
outgoing MTU = 1500
1 * * *
2 * * *
3 * * *
4 * * *
5 * * *
6 * * *
7 * * *


netstat -rn:

Routing tables
Destination Gateway Flags Refs Use If PMTU Exp Groups

Route Tree for Protocol Family 2 (Internet):
default 10.50.45.1 UGc 0 0 en1 - - =>
default 10.50.45.255 UGc 0 0 en1 - -
10.50.24.199 10.50.45.1 UGHW 1 1324 en1 1500 -
10.50.37/24 10.50.37.1 UGc 0 0 en1 - -
10.50.37.218 10.50.37.1 UGHW 1 1863 en1 1500 -
10.50.45/24 10.50.45.196 U 6 105 en1 - -
10.50.45.196 127.0.0.1 UGHS 8 617 lo0 - -
10.50.56.160 10.50.45.1 UGHW 3 31911 en1 1500 -
10.128.76.143 10.50.45.1 UGHW 0 146 en1 - 1
127/8 127.0.0.1 U 11 1888 lo0 - -

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


entstat -d ent1:

ETHERNET STATISTICS (ent1) :
Device Type: 10/100/1000 Base-TX PCI-X Adapter (14106902)
Hardware Address: 00:09:6b:be:b2:1d
Elapsed Time: 0 days 15 hours 17 minutes 43 seconds

Transmit Statistics: Receive Statistics:
-------------------- -------------------
Packets: 93072 Packets: 201152
Bytes: 19231484 Bytes: 48590302
Interrupts: 0 Interrupts: 174023
Transmit Errors: 0 Receive Errors: 0
Packets Dropped: 0 Packets Dropped: 0
Bad Packets: 0
Max Packets on S/W Transmit Queue: 12
S/W Transmit Queue Overflow: 0
Current S/W+H/W Transmit Queue Length: 1

Broadcast Packets: 283 Broadcast Packets: 98365
Multicast Packets: 0 Multicast Packets: 1229
No Carrier Sense: 0 CRC Errors: 0
DMA Underrun: 0 DMA Overrun: 0
Lost CTS Errors: 0 Alignment Errors: 0
Max Collision Errors: 0 No Resource Errors: 0
Late Collision Errors: 0 Receive Collision Errors: 0
Deferred: 0 Packet Too Short Errors: 0
SQE Test: 0 Packet Too Long Errors: 0
Timeout Errors: 0 Packets Discarded by Adapter: 0
Single Collision Count: 0 Receiver Start Count: 0
Multiple Collision Count: 0
Current HW Transmit Queue Length: 1

General Statistics:
-------------------
No mbuf Errors: 0
Adapter Reset Count: 0
Adapter Data Rate: 200
Driver Flags: Up Broadcast Running
Simplex 64BitSupport ChecksumTCP
ChecksumOffload PrivateSegment DataRateSet

10/100/1000 Base-TX PCI-X Adapter (14106902) Specific Statistics:
--------------------------------------------------------------------
Link Status: Up
Media Speed Selected: 100 Mbps Full Duplex
Media Speed Running: 100 Mbps Full Duplex
PCI Mode: PCI-X (100-133)
PCI Bus Width: 64-bit
Jumbo Frames: Disabled
TCP Segmentation Offload: Enabled
TCP Segmentation Offload Packets Transmitted: 1054
TCP Segmentation Offload Packet Errors: 0
Transmit and Receive Flow Control Status: Disabled
Transmit and Receive Flow Control Threshold (High): 32768
Transmit and Receive Flow Control Threshold (Low): 24576
Transmit and Receive Storage Allocation (TX/RX): 16/48

 

[hirschaj]

You have two default routes defined. Delete the one that is not correct. (Probably will have to delete 10.50.45.255).
Make sure that this extra default route is not defined in inet0..... lsattr -El inet0

Jim Hirschauer

http://www.aixexpert.com

 

[hasanjan]

i have removed the second gateway , but still same problem


netsta -rn :

Routing tables
Destination Gateway Flags Refs Use If PMTU Exp Groups

Route Tree for Protocol Family 2 (Internet):
default 10.50.45.1 UGc 0 0 et0 - -
10.50.24.199 10.50.45.1 UGHW 0 12 et0 1492 1
10.50.45/24 10.50.45.199 U 6 52 et0 - -
10.50.56.160 10.50.45.1 UGHW 3 1069 et0 1492 -
127/8 127.0.0.1 U 4 168 lo0 - -

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

lo0 16896 -

arp -a :
gkwi14 (10.50.45.195) at 0:6:29:84:cd:ea [ethernet]
gkwi73 (10.50.45.200) at 0:6:29:84:cf:25 [ethernet]
? (10.50.45.1) at 0:0:c:7:ac:2d [802.3]
? (10.50.45.3) at 0:1:64:10:b8:b4 [ethernet]
gkwi48 (10.50.45.204) at (incomplete)
gkwi01 (10.50.45.194) at (incomplete)

What does gkwi48 (10.50.45.204) at (incomplete) means ??

 

[p5wizard]

means your server hasn't yet received an ARP response I should think.

HTH,

p5wizard

 

[hasanjan]

Now the Problem ist from this host i can´t ping any host in the same subnet where this host, ping all other hosts in other subnet are ok

 

[mrn]

The gkwi48 is the hostname. Double check in your /etc/hosts file. I have seen a problem like this before and It turned out to be the router that was getting confused. Ask your Network people to take a look.

Can you provide a traceroute now you have removed the second default route.

Mike

"A foolproof method for sculpting an elephant: first, get a huge block of marble, then you chip away everything that doesn't look like an elephant."

http://www.airport-parking-site.co.uk/

 

[hasanjan]

/etc/hosts is ok

Traceroute :
trying to get source for gkwi48
source should be 10.50.45.199
traceroute to gkwi48 (10.50.45.204) from 10.50.45.199 (10.50.45.199), 30 hops max
outgoing MTU = 1492
1 * * *
2 * * *
3 * * *
4 * * *
5 * * *
6 * * *
7 * * *
8 * * *
9 * * *
10 * * *
11 * * *
12 * * *
13 * * *
14 * * *
15 * * *
16 * * *
17 * * *
18 * * *
19 * * *
20 * * *
21 * * *
22 * * *
23 * * *
24 * * *
25 * * *
26 * * *
27 * * *
28 * * *
29 * * *
30 * * *

When i add a static route the specifc host, the ping is ok, so the soultion can´t be to add static route for each host in the same subnet

 

[RMGBELGIUM]

did you do a refresh of inetd yet?
also, try unplugging the network cable, so the port on the switch will reset itself

rgds,

R.

 

[hirschaj]

Are the routing tables on your other servers in the same subnet correct? You can obviously ping the gateway which sits on the same subnet, so you might want to check routing on your other servers that you are unable to ping.

Jim Hirschauer

http://www.aixexpert.com