connectivity issue

[1221]

Hi,

I am having strange network issue, we have two Hp-UX 11.31servers, both the servers are in same IP segment, successfully setup passwordless SSH communication between both the servers, I can connect via ssh without giving password to the second server and vice versa, but suddenly with no change the both the servers cannot ping/SSH each other, although I am connected to both the servers from my machine using SSH.

Server 1 --> HISTST01:

oracle@HISTST01:/home/oracle$ ping 10.241.16.102
PING 10.241.16.102: 64 byte packets

----10.241.16.102 PING Statistics----
2 packets transmitted, 0 packets received, 100% packet loss

oracle@HISTST01[orcl1]:/home/oracle$ ping 10.241.16.102
PING 10.241.16.102: 64 byte packets
64 bytes from 10.241.16.102: icmp_seq=0. time=0. ms

----10.241.16.102 PING Statistics----
4 packets transmitted, 1 packets received, 75% packet loss
round-trip (ms) min/avg/max = 0/0/0

oracle@HISTST01[orcl1]:/home/oracle$ ping 10.241.16.102
PING 10.241.16.102: 64 byte packets
64 bytes from 10.241.16.102: icmp_seq=0. time=0. ms
64 bytes from 10.241.16.102: icmp_seq=1. time=0. ms
64 bytes from 10.241.16.102: icmp_seq=2. time=0. ms

----10.241.16.102 PING Statistics----
3 packets transmitted, 3 packets received, 0% packet loss
round-trip (ms) min/avg/max = 0/0/0

Server 2 --> HISTST02:

root@HISTST02:/etc/rc.config.d# ping 10.241.16.101
PING 10.241.16.101: 64 byte packets

----10.241.16.101 PING Statistics----
5 packets transmitted, 0 packets received, 100% packet loss

root@HISTST02:/etc/rc.config.d# ping 10.241.16.101
PING 10.241.16.101: 64 byte packets
64 bytes from 10.241.16.101: icmp_seq=0. time=0. ms
64 bytes from 10.241.16.101: icmp_seq=1. time=0. ms
64 bytes from 10.241.16.101: icmp_seq=2. time=0. ms
64 bytes from 10.241.16.101: icmp_seq=3. time=0. ms

----10.241.16.101 PING Statistics----
4 packets transmitted, 4 packets received, 0% packet loss
round-trip (ms) min/avg/max = 0/0/0

root@HISTST02:/# ping 10.241.16.101
PING 10.241.16.101: 64 byte packets

----10.241.16.101 PING Statistics----
9 packets transmitted, 0 packets received, 100% packet loss

I have to setup seemless connectivity for these servers for Oracle RAC environment.

Server1 Host file:

10.241.16.101 histst01.kfmc.med histst01
10.241.16.102 histst02.kfmc.med histst02

Server2 Host file:

10.241.16.101 HISTST01.kfmc.med HISTST01
10.241.16.102 HISTST02.kfmc.med HISTST02

HISTST01 -> / # ifconfig lan0
lan0: flags=1843<UP,BROADCAST,RUNNING,MULTICAST,CKO>
inet 10.241.16.101 netmask fffffff0 broadcast 10.241.16.111
HISTST01 -> / #
HISTST01 -> / # ifconfig lan1
lan1: flags=1843<UP,BROADCAST,RUNNING,MULTICAST,CKO>
inet 192.168.1.10 netmask ffffff00 broadcast 192.168.1.255
HISTST01 -> / #

Server 1 :netconf":

HOSTNAME="HISTST01"
OPERATING_SYSTEM=HP-UX
LOOPBACK_ADDRESS=127.0.0.1

INTERFACE_NAME[0]="lan0"
IP_ADDRESS[0]="10.241.16.101"
SUBNET_MASK[0]="255.255.255.240"
BROADCAST_ADDRESS[0]="10.241.16.111"
INTERFACE_STATE[0]="up"
DHCP_ENABLE[0]=0
INTERFACE_MODULES[0]=""

INTERFACE_NAME[1]="lan1"
IP_ADDRESS[1]="192.168.1.10"
SUBNET_MASK[1]="0xffffff00"
BROADCAST_ADDRESS[1]="192.168.1.255"
INTERFACE_STATE[1]="up"
DHCP_ENABLE[1]=0
INTERFACE_MODULES[1]=""

ROUTE_GATEWAY[1]="10.241.16.110"
ROUTE_DESTINATION[1]="default"
ROUTE_COUNT[1]="1"

HISTST02:/# ifconfig lan0
lan0: flags=1843<UP,BROADCAST,RUNNING,MULTICAST,CKO>
inet 10.241.16.102 netmask fffffff0 broadcast 10.241.16.111
HISTST02:/#
HISTST02:/#
HISTST02:/# ifconfig lan1
lan1: flags=1843<UP,BROADCAST,RUNNING,MULTICAST,CKO>
inet 192.168.1.11 netmask ffffff00 broadcast 192.168.1.255

Server 2 "netconf"

HOSTNAME="HISTST02"
OPERATING_SYSTEM=HP-UX
LOOPBACK_ADDRESS=127.0.0.1

ROUTE_MASK[0]=255.255.255.240
ROUTE_COUNT[0]="1"
ROUTE_DESTINATION[0]="default"
ROUTE_GATEWAY[0]="10.241.16.110"

INTERFACE_NAME[0]="lan0"
IP_ADDRESS[0]="10.241.16.102"
SUBNET_MASK[0]="255.255.255.240"
BROADCAST_ADDRESS[0]="10.241.16.111"
INTERFACE_STATE[0]="up"
DHCP_ENABLE[0]="0"
INTERFACE_MODULES[0]=""

INTERFACE_NAME[1]="lan1"
IP_ADDRESS[1]="192.168.1.11"
SUBNET_MASK[1]="255.255.255.0"
BROADCAST_ADDRESS[1]=""
INTERFACE_STATE[1]="up"
DHCP_ENABLE[1]="0"
INTERFACE_MODULES[1]=""

Any help would be appreciate.

Thanks.

[RAJD1]

Hi,

>  but suddenly with no change the both the servers cannot ping/SSH each other, although I am connected to both the servers from my machine using SSH.

- so I understand ssh is working but ping not working.

- Also what is the OS version.

- Can you do a linkloop test between two server adapter. HISTST01 & HISTST02 

from # linkloop -i <PPA>  <MAC>

if it says OK that means network level the connection between these two server is fine. And ping /ssh should not have any problem. 

HTH,

Raj D.

[1221]

Hi,

No even SSH is not working along with the ping.

linkloop between these two servers is OK.

HISTST01 -> / # ping 10.241.16.102
PING 10.241.16.102: 64 byte packets

----10.241.16.102 PING Statistics----
20 packets transmitted, 0 packets received, 100% packet loss

HISTST01 -> / # linkloop -i 0 0x1CC1DE3F30F2
Link connectivity to LAN station: 0x1CC1DE3F30F2
-- OK

HISTST02:/# ping 10.241.16.101

PING 10.241.16.101: 64 byte packets

----10.241.16.101 PING Statistics----
44 packets transmitted, 0 packets received, 100% packet loss

HISTST02:/# linkloop -i 0 0x1CC1DE3F3076
Link connectivity to LAN station: 0x1CC1DE3F3076
-- OK

Thanks.

[1221]

Hi,

Actually the issue was IP Address conflict, changed the IP address to resolved the issue.

Thanks.