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ICMP-IPv4 total length exceeds packet length

MariniSimone1975
Beginner
Beginner
I have a problem with +500byte ICMP packet, I am pinging from end-points residing outside ACI arriving in two different  L3OUT.
The ping suceed but in the pcap caputer from the APIC I see the following

Total Length: 528
 - [Expert Info (Error/Protocol): IPv4 total length exceeds packet length (182 bytes)]

 

1 0.000000000 172.25.164.38 172.25.38.1 ICMP 246 Echo (ping) request id=0x003f, seq=51002/15047, ttl=126 (no response found!)

2 0.000091094 172.25.164.38 172.25.38.1 ICMP 246 Echo (ping) request id=0x003f, seq=51002/15047, ttl=123 (reply in 3)

3 0.000709328 172.25.38.1 172.25.164.38 ICMP 246 Echo (ping) reply id=0x003f, seq=51002/15047, ttl=255 (request in 2)

4 0.003341978 172.25.38.1 172.25.164.38 ICMP 246 Echo (ping) reply id=0x003f, seq=51002/15047, ttl=252

 

Can someone help me to undestand what is the reason for the this error and how to solve it?

 

Thanks in advance

Simone

3 Replies 3

CummingsEvelyn
Beginner
Beginner

The total length is the length of the whole packet. This is a 16 bit field, so it can have numbers between 0 and 65535. These numbers represent bytes directly. atlas fusd

MariniSimone1975
Beginner
Beginner

Yes, but i still do not understand why in the pcap captured from ACI I see "IPv4 total length exceeds packet length"

MHM Cisco World
VIP Mentor VIP Mentor
VIP Mentor

I now a little about ACI but I know it work for Spine and Leaf and NSK device, check the CoPP of NSK if it allow this size or not.

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