https://community.hpe.com/t5/operating-system-openvms/numerous-calls-to-icmp-error/m-p/4590553#M59198 Hi Folks,<BR /><BR />I'm seeing a lot of this errors on our nodes and would just like to get some points on how to troubleshoot here:<BR /><BR />$ tcpip show prot icmp<BR />icmp: <BR /> 28116 calls to icmp_error<BR /> 0 errors not generated because old ip message was too short<BR /> 0 errors not generated because old message was icmp<BR /> Output histogram:<BR /> echo reply: 362556<BR /> destination unreachable: 28116<BR /> 0 messages with bad code fields<BR /> 0 messages &lt; minimum length<BR /> 0 bad checksums<BR /> 0 messages with bad length<BR /> Input histogram:<BR /> echo reply: 887448<BR /> destination unreachable: 224<BR /> echo: 362556<BR /> router solicitation: 3<BR /> address mask request: 3<BR /> 362556 message responses generated<BR />$<BR /><BR />1. Is this kind of error specific to a single network card? Because on our nodes, we have 2 network cards and 1 is not used but is still active.<BR />2. I have read somewhere that this might be due to the fact that the router where our node is connected to might be experiencing high utilization. What should I ask our network admin to check first in this case?<BR />3. The item "destination unreachable" seems to equate to the number of calls to icmp_error. How can I see which destination it is trying to reach? Will this be visible on any of our log files? I can't seem to see it on the operator.log yet.<BR /><BR />This node is an ES80 on OpenVMS 7.3-2, TCPIP v5.4 ECO7.<BR /><BR />Thanks. Thu, 25 Feb 2010 02:22:25 GMT roose 2010-02-25T02:22:25Z https://community.hpe.com/t5/operating-system-openvms/numerous-calls-to-icmp-error/m-p/4590553#M59198 Hi Folks,<BR /><BR />I'm seeing a lot of this errors on our nodes and would just like to get some points on how to troubleshoot here:<BR /><BR />$ tcpip show prot icmp<BR />icmp: <BR /> 28116 calls to icmp_error<BR /> 0 errors not generated because old ip message was too short<BR /> 0 errors not generated because old message was icmp<BR /> Output histogram:<BR /> echo reply: 362556<BR /> destination unreachable: 28116<BR /> 0 messages with bad code fields<BR /> 0 messages &lt; minimum length<BR /> 0 bad checksums<BR /> 0 messages with bad length<BR /> Input histogram:<BR /> echo reply: 887448<BR /> destination unreachable: 224<BR /> echo: 362556<BR /> router solicitation: 3<BR /> address mask request: 3<BR /> 362556 message responses generated<BR />$<BR /><BR />1. Is this kind of error specific to a single network card? Because on our nodes, we have 2 network cards and 1 is not used but is still active.<BR />2. I have read somewhere that this might be due to the fact that the router where our node is connected to might be experiencing high utilization. What should I ask our network admin to check first in this case?<BR />3. The item "destination unreachable" seems to equate to the number of calls to icmp_error. How can I see which destination it is trying to reach? Will this be visible on any of our log files? I can't seem to see it on the operator.log yet.<BR /><BR />This node is an ES80 on OpenVMS 7.3-2, TCPIP v5.4 ECO7.<BR /><BR />Thanks. Thu, 25 Feb 2010 02:22:25 GMT https://community.hpe.com/t5/operating-system-openvms/numerous-calls-to-icmp-error/m-p/4590553#M59198 roose 2010-02-25T02:22:25Z https://community.hpe.com/t5/operating-system-openvms/numerous-calls-to-icmp-error/m-p/4590554#M59199 The "destination unreachable" typically indicates that your adjacent router is having a problem forwarding packets from your server onward to their destination. Routers send these messages back to the source when it can not successfully forward a packet. Could be that the destination host is down, a network link on the other side of the router is down, the host that is supposed to recieve the packets is not listening on the target port, or a myriad of other things. You _probably_ need not be concerned with your host. You'll _likely_ want to be looking on the other side of your local routers for the issue (if there still is an issue). Thu, 25 Feb 2010 13:10:40 GMT https://community.hpe.com/t5/operating-system-openvms/numerous-calls-to-icmp-error/m-p/4590554#M59199 Jim_McKinney 2010-02-25T13:10:40Z