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Re: possible ppp problems

To: Brian Somers <brian@Awfulhak.org>
Subject: Re: possible ppp problems
From: Michael Lee Crogan <mcrogan@lanl.gov>
Date: Thu, 23 Mar 2000 16:26:13 -0700 (MST)
Cc: misc@openbsd.org, brian@hak.lan.Awfulhak.org
References: <mcrogan@lanl.gov><14554.17505.877767.768586@holomorphic.lanl.gov><200003231823.SAA00662@hak.lan.Awfulhak.org>
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>>>>> "brian" == Brian Somers <brian@Awfulhak.org> writes:

 > Hmm, the only suggestion I can make is that maybe you're having 
 > fragmentation difficulties (are you NATing too ?).  How about 
 > trying an increased MTU on the ppp link ?

I tried increasing the mtu/mru.  I'm not NATting.  The fragmentation
idea sounds interesting.  I have included the output of a ping.
Initially, I have almost no traffic.  Then, I start an FTP to fetch
base26.tar.gz.  That occurs around icmp_seq=60.  You'll notice that the
time increases dramatically.  Note at the end of the output, too, as it
shows a packet with a much higher icmp_seq.  It seems that I was wrong
before when I said that it hangs indefinitely.  In fact, there is quite
a bit of delay in a ping, but it does not delay indefinitely.

Also, about 20 physical seconds after the delays began in the ping, I
tapped Control-C on the FTP, which would abort the high rate of
transfer.  I noticed the abort show up (i.e. the Control-C got through)
approximately 25 seconds after I pressed it.  Keep this in mind if you
decide to take a look at the ping output.

I am strongly considering alternatives at this point, as ssh/ppp seems
not to be working well.

 > You could also try using ppp(8) on the OpenBSD side :*)  You can just

 >   set device "!ssh ....."

 > to create the tunnel.

Hmm.  What is the advantage of using ppp?  I do not know much about it.
I will have to take a look at this option.

64 bytes from 10.10.10.10: icmp_seq=20 ttl=255 time=94.5 ms
64 bytes from 10.10.10.10: icmp_seq=21 ttl=255 time=93.5 ms
64 bytes from 10.10.10.10: icmp_seq=22 ttl=255 time=93.7 ms
64 bytes from 10.10.10.10: icmp_seq=23 ttl=255 time=93.0 ms
64 bytes from 10.10.10.10: icmp_seq=24 ttl=255 time=93.4 ms
64 bytes from 10.10.10.10: icmp_seq=25 ttl=255 time=92.7 ms
64 bytes from 10.10.10.10: icmp_seq=26 ttl=255 time=92.2 ms
64 bytes from 10.10.10.10: icmp_seq=27 ttl=255 time=92.4 ms
64 bytes from 10.10.10.10: icmp_seq=28 ttl=255 time=91.8 ms
64 bytes from 10.10.10.10: icmp_seq=29 ttl=255 time=91.9 ms
64 bytes from 10.10.10.10: icmp_seq=30 ttl=255 time=92.2 ms
64 bytes from 10.10.10.10: icmp_seq=31 ttl=255 time=92.2 ms
64 bytes from 10.10.10.10: icmp_seq=32 ttl=255 time=91.3 ms
64 bytes from 10.10.10.10: icmp_seq=33 ttl=255 time=91.9 ms
64 bytes from 10.10.10.10: icmp_seq=34 ttl=255 time=91.8 ms
64 bytes from 10.10.10.10: icmp_seq=35 ttl=255 time=91.7 ms
64 bytes from 10.10.10.10: icmp_seq=36 ttl=255 time=91.4 ms
64 bytes from 10.10.10.10: icmp_seq=37 ttl=255 time=91.7 ms
64 bytes from 10.10.10.10: icmp_seq=38 ttl=255 time=91.6 ms
64 bytes from 10.10.10.10: icmp_seq=39 ttl=255 time=91.0 ms
64 bytes from 10.10.10.10: icmp_seq=40 ttl=255 time=90.5 ms
64 bytes from 10.10.10.10: icmp_seq=41 ttl=255 time=90.3 ms
64 bytes from 10.10.10.10: icmp_seq=42 ttl=255 time=89.9 ms
64 bytes from 10.10.10.10: icmp_seq=43 ttl=255 time=89.7 ms
64 bytes from 10.10.10.10: icmp_seq=44 ttl=255 time=91.1 ms
64 bytes from 10.10.10.10: icmp_seq=45 ttl=255 time=91.0 ms
64 bytes from 10.10.10.10: icmp_seq=46 ttl=255 time=90.0 ms
64 bytes from 10.10.10.10: icmp_seq=47 ttl=255 time=89.4 ms
64 bytes from 10.10.10.10: icmp_seq=48 ttl=255 time=90.5 ms
64 bytes from 10.10.10.10: icmp_seq=49 ttl=255 time=89.6 ms
64 bytes from 10.10.10.10: icmp_seq=50 ttl=255 time=89.1 ms
64 bytes from 10.10.10.10: icmp_seq=51 ttl=255 time=89.2 ms
64 bytes from 10.10.10.10: icmp_seq=52 ttl=255 time=88.9 ms
64 bytes from 10.10.10.10: icmp_seq=53 ttl=255 time=89.0 ms
64 bytes from 10.10.10.10: icmp_seq=54 ttl=255 time=88.8 ms
64 bytes from 10.10.10.10: icmp_seq=55 ttl=255 time=88.6 ms
64 bytes from 10.10.10.10: icmp_seq=56 ttl=255 time=90.6 ms
64 bytes from 10.10.10.10: icmp_seq=57 ttl=255 time=88.6 ms
64 bytes from 10.10.10.10: icmp_seq=58 ttl=255 time=87.9 ms
64 bytes from 10.10.10.10: icmp_seq=59 ttl=255 time=87.9 ms
64 bytes from 10.10.10.10: icmp_seq=60 ttl=255 time=137.0 ms
64 bytes from 10.10.10.10: icmp_seq=61 ttl=255 time=87.4 ms
64 bytes from 10.10.10.10: icmp_seq=62 ttl=255 time=97.0 ms
64 bytes from 10.10.10.10: icmp_seq=63 ttl=255 time=97.6 ms
64 bytes from 10.10.10.10: icmp_seq=64 ttl=255 time=87.2 ms
64 bytes from 10.10.10.10: icmp_seq=65 ttl=255 time=87.2 ms
64 bytes from 10.10.10.10: icmp_seq=66 ttl=255 time=86.4 ms
64 bytes from 10.10.10.10: icmp_seq=67 ttl=255 time=106.7 ms
64 bytes from 10.10.10.10: icmp_seq=68 ttl=255 time=86.6 ms
64 bytes from 10.10.10.10: icmp_seq=69 ttl=255 time=167.4 ms
64 bytes from 10.10.10.10: icmp_seq=70 ttl=255 time=206.9 ms
64 bytes from 10.10.10.10: icmp_seq=71 ttl=255 time=248.4 ms
64 bytes from 10.10.10.10: icmp_seq=76 ttl=255 time=2943.7 ms
64 bytes from 10.10.10.10: icmp_seq=77 ttl=255 time=5945.9 ms
64 bytes from 10.10.10.10: icmp_seq=78 ttl=255 time=4945.9 ms
64 bytes from 10.10.10.10: icmp_seq=79 ttl=255 time=5094.5 ms
64 bytes from 10.10.10.10: icmp_seq=80 ttl=255 time=4174.4 ms
64 bytes from 10.10.10.10: icmp_seq=92 ttl=255 time=18904.8 ms
64 bytes from 10.10.10.10: icmp_seq=93 ttl=255 time=17904.8 ms
64 bytes from 10.10.10.10: icmp_seq=111 ttl=255 time=24089.9 ms
64 bytes from 10.10.10.10: icmp_seq=112 ttl=255 time=28100.2 ms
64 bytes from 10.10.10.10: icmp_seq=113 ttl=255 time=28088.4 ms
64 bytes from 10.10.10.10: icmp_seq=114 ttl=255 time=29548.3 ms
64 bytes from 10.10.10.10: icmp_seq=115 ttl=255 time=28548.2 ms
64 bytes from 10.10.10.10: icmp_seq=116 ttl=255 time=29088.4 ms
64 bytes from 10.10.10.10: icmp_seq=117 ttl=255 time=29087.7 ms
64 bytes from 10.10.10.10: icmp_seq=118 ttl=255 time=30098.1 ms
64 bytes from 10.10.10.10: icmp_seq=135 ttl=255 time=20095.5 ms
64 bytes from 10.10.10.10: icmp_seq=136 ttl=255 time=20095.8 ms
64 bytes from 10.10.10.10: icmp_seq=137 ttl=255 time=20095.3 ms
64 bytes from 10.10.10.10: icmp_seq=138 ttl=255 time=20095.1 ms
64 bytes from 10.10.10.10: icmp_seq=139 ttl=255 time=20095.5 ms
64 bytes from 10.10.10.10: icmp_seq=140 ttl=255 time=20095.0 ms
64 bytes from 10.10.10.10: icmp_seq=141 ttl=255 time=20094.5 ms
64 bytes from 10.10.10.10: icmp_seq=142 ttl=255 time=20094.6 ms
64 bytes from 10.10.10.10: icmp_seq=143 ttl=255 time=20094.2 ms
64 bytes from 10.10.10.10: icmp_seq=144 ttl=255 time=22094.5 ms
64 bytes from 10.10.10.10: icmp_seq=145 ttl=255 time=22094.4 ms
64 bytes from 10.10.10.10: icmp_seq=151 ttl=255 time=47102.6 ms
64 bytes from 10.10.10.10: icmp_seq=152 ttl=255 time=49091.1 ms
64 bytes from 10.10.10.10: icmp_seq=153 ttl=255 time=49091.2 ms
64 bytes from 10.10.10.10: icmp_seq=154 ttl=255 time=49090.4 ms
64 bytes from 10.10.10.10: icmp_seq=155 ttl=255 time=49090.2 ms
64 bytes from 10.10.10.10: icmp_seq=156 ttl=255 time=49090.2 ms
64 bytes from 10.10.10.10: icmp_seq=157 ttl=255 time=49090.6 ms
64 bytes from 10.10.10.10: icmp_seq=158 ttl=255 time=49090.5 ms
64 bytes from 10.10.10.10: icmp_seq=159 ttl=255 time=49090.0 ms
64 bytes from 10.10.10.10: icmp_seq=160 ttl=255 time=49089.7 ms
64 bytes from 10.10.10.10: icmp_seq=161 ttl=255 time=49089.9 ms
64 bytes from 10.10.10.10: icmp_seq=162 ttl=255 time=49089.4 ms
64 bytes from 10.10.10.10: icmp_seq=163 ttl=255 time=49097.6 ms
64 bytes from 10.10.10.10: icmp_seq=164 ttl=255 time=49089.0 ms
64 bytes from 10.10.10.10: icmp_seq=165 ttl=255 time=48919.5 ms
64 bytes from 10.10.10.10: icmp_seq=166 ttl=255 time=48089.8 ms
64 bytes from 10.10.10.10: icmp_seq=167 ttl=255 time=48088.9 ms
64 bytes from 10.10.10.10: icmp_seq=232 ttl=255 time=31680.7 ms
64 bytes from 10.10.10.10: icmp_seq=233 ttl=255 time=30680.7 ms
64 bytes from 10.10.10.10: icmp_seq=234 ttl=255 time=30090.3 ms
64 bytes from 10.10.10.10: icmp_seq=235 ttl=255 time=33090.4 ms
64 bytes from 10.10.10.10: icmp_seq=236 ttl=255 time=35090.0 ms
64 bytes from 10.10.10.10: icmp_seq=237 ttl=255 time=37089.9 ms
64 bytes from 10.10.10.10: icmp_seq=238 ttl=255 time=39910.1 ms
64 bytes from 10.10.10.10: icmp_seq=239 ttl=255 time=41089.2 ms
64 bytes from 10.10.10.10: icmp_seq=240 ttl=255 time=41088.8 ms
64 bytes from 10.10.10.10: icmp_seq=241 ttl=255 time=41088.8 ms
64 bytes from 10.10.10.10: icmp_seq=242 ttl=255 time=41088.9 ms
64 bytes from 10.10.10.10: icmp_seq=243 ttl=255 time=41088.2 ms
64 bytes from 10.10.10.10: icmp_seq=244 ttl=255 time=41088.2 ms
64 bytes from 10.10.10.10: icmp_seq=245 ttl=255 time=41089.2 ms
64 bytes from 10.10.10.10: icmp_seq=246 ttl=255 time=41088.4 ms
64 bytes from 10.10.10.10: icmp_seq=247 ttl=255 time=41087.6 ms
64 bytes from 10.10.10.10: icmp_seq=248 ttl=255 time=41087.5 ms
64 bytes from 10.10.10.10: icmp_seq=249 ttl=255 time=41087.5 ms
64 bytes from 10.10.10.10: icmp_seq=250 ttl=255 time=41092.3 ms
64 bytes from 10.10.10.10: icmp_seq=251 ttl=255 time=41097.4 ms
64 bytes from 10.10.10.10: icmp_seq=252 ttl=255 time=41097.5 ms
64 bytes from 10.10.10.10: icmp_seq=253 ttl=255 time=46096.7 ms
64 bytes from 10.10.10.10: icmp_seq=254 ttl=255 time=49096.8 ms
64 bytes from 10.10.10.10: icmp_seq=255 ttl=255 time=49096.0 ms
64 bytes from 10.10.10.10: icmp_seq=256 ttl=255 time=49096.3 ms
64 bytes from 10.10.10.10: icmp_seq=257 ttl=255 time=49096.4 ms
64 bytes from 10.10.10.10: icmp_seq=258 ttl=255 time=49098.2 ms
64 bytes from 10.10.10.10: icmp_seq=259 ttl=255 time=49095.9 ms
64 bytes from 10.10.10.10: icmp_seq=260 ttl=255 time=49096.2 ms
64 bytes from 10.10.10.10: icmp_seq=261 ttl=255 time=50765.1 ms
64 bytes from 10.10.10.10: icmp_seq=262 ttl=255 time=50095.5 ms
64 bytes from 10.10.10.10: icmp_seq=263 ttl=255 time=49334.6 ms
64 bytes from 10.10.10.10: icmp_seq=349 ttl=255 time=24094.4 ms

Michael Lee Crogan -- <mcrogan@lanl.gov>

Los Alamos National Laboratory
Computing, Information, and Communications Division (CIC-5)
Research And Development In Advanced Network Technology (RADIANT)

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References:
- Re: possible ppp problems
  - From: Michael Lee Crogan <mcrogan@lanl.gov>
- Re: possible ppp problems
  - From: Brian Somers <brian@Awfulhak.org>
- Re: possible ppp problems
  - From: Brian Somers <brian@Awfulhak.org>
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