Re: Change MTU settings on Solaris 5.9

[Cory Stoker <cory () clearnetsec com>]

I think  this is what you need but I did not verify it on my Solaris  
box beforehand:

disable PMTUD:
# ndd -set /dev/ip ip_path_mtu_discovery 0

set maximum MSS to 1460:
# ndd -set /dev/tcp tcp_mss_max 1460

You can enumerate the options to change by using ndd as well.

$ man ndd

---
Cory Stoker
ClearNet Security

On Oct 12, 2005, at 10:28 AM, hpalmer () comsquared com wrote:

> Recently a customer of ours has been having an issue w/ remote  
> login from multiple customers on there network.  Our company  
> installed, configured and setup A Sun Fire V250. The issue, there  
> NetAdmin states, "Our customers are not able to login to your /our  
> Sun Box because the MTU is at the default setting of 1500 and needs  
> to be 1480 or 1460."  This  I (System Database Admin) believe is  
> totally wrong.  But to prove a point I would like to check the  
> current settings and make changes if needed.
> I read some where before that the changes could be made in /etc/ 
> networks/interfaces, but not able to locate that directory...
>
> any suggestions?
>
> Do or do not, there is no try. -Yoda.