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Donovan-Martin06
Beginner

DMartin09

My post question can you adjust the TCP MSS on a Nexus 7000 switch.

2 REPLIES 2
Matthew Blanshard
Cisco Employee

Hello Donovan,

While the command ip tcp adjust-mss <> is not supported on the nexus you can use an alternative workaround of creating an ACl like this:

interface Ethernet1/1

mtu 1600

ip access-group drop-large-packets in

ip address 10.10.10.1/30

no shutdown

ip access-list extended drop-large-packets

statistics per-entry

deny ip any any packet-length gt 1600

permit ip any any

The ACL will send an icmp unreachable to the host.

HTH,

Matt

Hello Matthew!

May i ask you how it is going to work?

I the Nexus sends an ICMP host unreachable the host is going to stop transmitting.

I think Nexus should send something like fragmentation is needed. Could you clarify on that please?