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It is not so uncommon. It seems that your Firewall does do some kind of MSS adjustment:

• https://www.cisco.com/c/en/us/td/docs/ios/12_2sb/12_2sba/feature/guide/sb_admss.pdf
• https://www.cisco.com/c/en/us/support/docs/ip/generic-routing-encapsulation-gre/25885-pmtud-ipfrag.html
• https://crnetpackets.com/2016/01/27/the-relation-between-maximum-transmission-unit-mtu-and-the-maximum-segment-size-mss/

Maybe there is some kind of tunnel (VPN) in your Path.

It is not so uncommon. It seems that your Firewall does do some kind of MSS adjustment:

• https://www.cisco.com/c/en/us/td/docs/ios/12_2sb/12_2sba/feature/guide/sb_admss.pdf
• https://www.cisco.com/c/en/us/support/docs/ip/generic-routing-encapsulation-gre/25885-pmtud-ipfrag.html
• https://crnetpackets.com/2016/01/27/the-relation-between-maximum-transmission-unit-mtu-and-the-maximum-segment-size-mss/

Maybe there is some kind of tunnel (VPN) in your Path.

It is not so uncommon. It seems that your Firewall does do some kind of MSS adjustment:

• https://www.cisco.com/c/en/us/td/docs/ios/12_2sb/12_2sba/feature/guide/sb_admss.pdfAdjustMSS
• https://www.cisco.com/c/en/us/support/docs/ip/generic-routing-encapsulation-gre/25885-pmtud-ipfrag.html
• https://crnetpackets.com/2016/01/27/the-relation-between-maximum-transmission-unit-mtu-and-the-maximum-segment-size-mss/

Maybe there is some kind of tunnel (VPN) in your Path.

It is not so uncommon. It seems that your Firewall does do some kind of MSS adjustment:

• AdjustMSS
• https://www.cisco.com/c/en/us/support/docs/ip/generic-routing-encapsulation-gre/25885-pmtud-ipfrag.htmlTunnel Mitigations
• https://crnetpackets.com/2016/01/27/the-relation-between-maximum-transmission-unit-mtu-and-the-maximum-segment-size-mss/MTU vs MSS

Maybe there is some kind of tunnel (VPN) in your Path.

It is not so uncommon. It seems that your Firewall does do some kind of MSS adjustment:

Here are some interesting links about this topic:

• AdjustMSS
• Tunnel Mitigations
• MTU vs MSS

Maybe there is some kind of tunnel (VPN) in your Path.

It is not so uncommon. It seems that your Firewall does do some kind of MSS adjustment:

Here are some interesting links about this topic:

• AdjustMSS
• Tunnel Mitigations
• MTU vs MSS

Maybe there is some kind of tunnel (VPN) in your Path.