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Determine ideal MTU without ping?
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grant123
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Joined: 23 Mar 2005
Posts: 643

PostPosted: Sun Aug 25, 2013 10:15 am    Post subject: Determine ideal MTU without ping? Reply with quote

I'm currently connecting to the internet by tethering to my cell phone. I'd like to determine my ideal MTU but from what I understand this is done via pings and I get 100% packet loss when pinging so my ISP must be dropping them. Is there anything else I can do to figure this out?
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PaulBredbury
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Joined: 14 Jul 2005
Posts: 7310

PostPosted: Sun Aug 25, 2013 2:06 pm    Post subject: Reply with quote

You didn't mention who you're trying to ping. Try e.g.:
Code:
ping -s 1464 -M do www.dslreports.com
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Hu
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Joined: 06 Mar 2007
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PostPosted: Sun Aug 25, 2013 2:51 pm    Post subject: Reply with quote

With the right configuration, PMTUD should handle this for you. Have you disabled PMTUD?
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grant123
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Joined: 23 Mar 2005
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PostPosted: Sun Aug 25, 2013 3:08 pm    Post subject: Reply with quote

PaulBredbury, I lose all of those pings unfortunately.

Hu, how is PMTUD enabled/disabled on Gentoo?
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massimo
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Joined: 22 Jun 2003
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PostPosted: Wed Aug 28, 2013 5:53 am    Post subject: Reply with quote

grant123 wrote:
PaulBredbury, I lose all of those pings unfortunately.

Hu, how is PMTUD enabled/disabled on Gentoo?


disable pmtu discovery
Code:
sysctl -w ip_no_pmtu_disc=1

enable pmtu discovery
Code:
sysctl -w ip_no_pmtu_disc=0

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grant123
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PostPosted: Sun Sep 01, 2013 7:40 am    Post subject: Reply with quote

Thank you!
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