Questions tagged [pmtud]

For questions on Path MTU discovery.

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IP fragmentation and PMTUD

I have 2 questions. 1) According to a lot of sources, when IP packets gets fragmented, in this case, lets take icmp, the icmp header is present only in the first packet. But I have observed on some ...
RRHS's user avatar
  • 395
4 votes
2 answers
318 views

TCP MSS - Dynamic Adjustment

I've seen most of TCP flows having DF bit set. So, can any additional overheads like VXLAN cause TCP packet to be dropped (since DF bit set)? How will the TCP MSS be adjusted dynamically (in absence ...
Alan's user avatar
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How exactly does Path-MTU Blackhole Detection work?

I'm currently trying to understand how the Path-MTU Blackhole Detection really works. From what I understand: You send rather big packets, starting at like 1460 Bytes (TCP example) and wait for ...
Gereon99's user avatar
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1 answer
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OSI model transition between layers (data chunking across layers)

There is something I don't understand regarding the OSI model. From what I learned, sometimes information will need to broken down into smaller pieces of information. My question is - let's say that ...
RandomAsker889's user avatar
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2 answers
1k views

MTU the most Confusing Networking term. Lot of questions

I have ton of questions and i feel this is most confusing term for me. The more i read the confusion deepens. I am not able to connect dots. please help. Do we need MTU adjustment with EoMPLS/dot1q ...
Terminator's user avatar
4 votes
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329 views

Can the MTU size change on a local network if non of my software attempt to do that?

From the ip manual page (man 7 ip), we read that the MTU may change over time. When PMTU discovery is enabled, the kernel automatically keeps track of the path MTU per destination host. When it is ...
Alexis Wilke's user avatar