One way ping happens however reverse does not work.

I have two hosts ssux0049 and nus642.
ssux0049 can ping nus642
nus642 can not ping ssux0049
Here are few details that you might be interested to look at.
1.> DNS can resolve the hosts
nus642 # nslookup ssux0049
Server: 144.132.81.10
Address: 144.132.81.10#53
Non-authoritative answer:
Name: ssux0049.example.com
Address: 10.106.192.220
ssux0049 $ nslookup nus642
Server: 144.136.201.10
Address: 144.136.201.10#53
Name: nus642.in.example.com
Address: 146.132.2.6
2.>
nus642 # ping -a ssux0049
no answer from ssux0049(10.106.192.220)
nus642 #
ssux0049 $ ping -a nus642
nus642 (146.132.2.6) is alive
ssux0049 $
3.>
nus642 # ifconfig -a
lo0: flags=2001000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4,VIRTUAL> mtu 8232 index 1
inet 127.0.0.1 netmask ff000000
ixgbe0: flags=1001000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4,FIXEDMTU> mtu 9000 index 2
inet 10.86.211.5 netmask ffffffe0 broadcast 10.86.211.31
groupname VLAN_2010
ether 0:1b:21:57:1e:aa
ixgbe1: flags=1001000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4,FIXEDMTU> mtu 1500 index 3
inet 146.132.2.6 netmask ffffff80 broadcast 146.132.2.127
groupname VLAN_2004
ether 0:1b:21:57:1e:b4
ssux0049 $ ifconfig -a
lo0: flags=2001000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4,VIRTUAL> mtu 8232 index 1
inet 127.0.0.1 netmask ff000000
nxge2: flags=1009040843<UP,BROADCAST,RUNNING,MULTICAST,DEPRECATED,IPv4,NOFAILOVER,FIXEDMTU> mtu 1500 index 2
inet 172.84.166.44 netmask ffffff00 broadcast 172.84.166.255
groupname ssux0049-172841660
ether 0:21:28:84:b9:12
ssux0049 $
5.>
nus642 # traceroute ssux0049
traceroute: Warning: Multiple interfaces found; using 10.86.219.32 @ ixgbe2005000 --> Should it be using this gateway as per netstat output? If no, can I change
traceroute to ssux0049 (10.106.192.220), 30 hops max, 40 byte packets this to some other available gateway?
1 10.86.208.3 (10.86.208.3) 0.372 ms 0.262 ms 0.193 ms
2 * * *
3 * * *
4 *
I have checked gateways can be pinged. Let me know if you need more details to resolve this issue.
Thanks,
DR
Edited by: 949530 on Jul 27, 2012 4:59 PM
Edited by: 949530 on Jul 29, 2012 12:25 PM
Edited by: 949530 on Jul 29, 2012 3:10 PM

Hi.
It's look like Firewall settings betwen this hosts.
You can start traceroute  nus642 from ssux0049 and write all intermediate routers.
After try ping all of hime from nus642. It can be help found point of problem.
But again, firewall can have different rultes for different protocols and networks.
Regards.

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