Keyword Analysis & Research: icmpinerrors


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What are icmpmsgintype and ICMP msgouttype?

They are IcmpMsgInType [N] and IcmpMsgOutType [N], the [N] indicates the ICMP type number. These counters track all kinds of ICMP packets. The ICMP type number definition could be found in the ICMP parameters document. For example, if the Linux kernel sends an ICMP Echo packet, the IcmpMsgOutType8 would increase 1.

What does the 'in' and 'out' counter mean in ICMP?

The ‘In’ counter means kernel receives such a packet and the ‘Out’ counter means kernel sends such a packet. They are IcmpMsgInType [N] and IcmpMsgOutType [N], the [N] indicates the ICMP type number.

What is the ICMP output path?

The ICMP output path will check the header of a raw socket, so the IcmpOutMsgs would still be updated if the IP header is constructed by a userspace program. These counters include most of common ICMP types, they are: Every ICMP type has two counters: ‘In’ and ‘Out’.

What happens if the ICMP packet has an invalid type?

As mentioned in the RFC1213, these two counters include errors, they would be increased even if the ICMP packet has an invalid type. The ICMP output path will check the header of a raw socket, so the IcmpOutMsgs would still be updated if the IP header is constructed by a userspace program.

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