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Fragmentation in the IPSe...

Fragmentation in the IPSec tunnel

Created: Sep 29, 2020 12:59:28Latest reply: Sep 29, 2020 13:26:23 392 2 0 0 0
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Hi,

From the documentation, the command ipsec fragmentation sets the fragmentation mode of packets to fragmentation before encryption for all IPSec tunnels.

Could I run this command for specific ipsec policy? I mean if I configure this command, could it affect other tunnels where fragmentation will do before encryption?

If yes, how should I describe ipsec df-bit in such scenario if I allow in policy ipsec fragmentation before encryption?

Could I describe there (in policy) also tcp mss value need to be 1379 bytes, but I understood that this is global parameter?

Thank you for clarifying!


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chenhui
Admin Created Sep 29, 2020 13:26:23

Hi,
Kindly refer the explain bnelo
1. Yes, this is a global paramter, which means it will affect all the IPSec tunnels.
2. To fragment the df-bit set packets, you can run command ipsec fragmentation ignore df-bit, it allow the device ignor the Don't Fragment (DF) flag bit of original packets.
3. If you are searching a way to unfragment the packets, and no packets dropping, you an run ipsec negotiate-mtu, this comand tune th MTU value of the IPSec negotiation as you set.
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chenhui
chenhui Admin Created Sep 29, 2020 13:00:39

Hi,
Kindly wait a second, we're processing on you question already.
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chenhui
chenhui Admin Created Sep 29, 2020 13:26:23

Hi,
Kindly refer the explain bnelo
1. Yes, this is a global paramter, which means it will affect all the IPSec tunnels.
2. To fragment the df-bit set packets, you can run command ipsec fragmentation ignore df-bit, it allow the device ignor the Don't Fragment (DF) flag bit of original packets.
3. If you are searching a way to unfragment the packets, and no packets dropping, you an run ipsec negotiate-mtu, this comand tune th MTU value of the IPSec negotiation as you set.
View more
  • x
  • convention：
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