Lost ping packets on home network with masquerading linux machine

Lost ping packets on home network with masquerading linux machine

Post by Daniel To » Tue, 12 Nov 2002 00:29:18



This one may bore you to tears but I have missing ping packets when
pinging certain sites ebay google etc.  This was indictaed by Visual
Route 5.4a (pc app).  It says that the loss starts at my Linux(2.0.36
486 66Mhz) machine ( PC -> Linux(Masquerading) -> ppp link -> Demon )
Also my Linux machine doesn't have Apache running!  But does not give
furthur help!  Is the problem really with my Linux machine? (i.e. is
it too slow):

    3:24pm  up 100 days, 21:30,  6 users,  load average: 0.35, 0.17,
0.10
    61 processes: 60 sleeping, 1 running, 0 zombie, 0 stopped
    CPU states:  3.7% user,  9.0% system,  0.0% nice, 87.4% idle
    Mem:  94624K av, 91648K used,  2976K free, 25420K shrd, 51036K
buff
    Swap: 72256K av,  2188K used, 70068K free               21664K
cached

Also I have an occasional problem with TCP/UDP checksum errors but I
believe that this is due to the VJ compression used as pointed out in
other postings.

Many thanks for your help.
-------------------------

This is the output from my linux machine:

     > ping www2.ebay.com
     PING pogona.ebay.com (209.10.222.194): 56 data bytes
     64 bytes from 209.10.222.194: icmp_seq=0 ttl=242 time=725.4 ms
     64 bytes from 209.10.222.194: icmp_seq=1 ttl=242 time=778.1 ms
     64 bytes from 209.10.222.194: <snip!>

      --- pogona.ebay.com ping statistics ---
     20 packets transmitted, 12 packets received, 40% packet loss
     round-trip min/avg/max = 280.5/409.8/778.1 ms

and this from visual route running on the pc:

================================================
=== VisualRoute report on 10-Nov-02 15:17:44 ===
================================================

Report for www2.ebay.com [209.10.222.194]

Analysis: 'www2.ebay.com' was found in 16 hops (TTL=241). But,
problems starting at hop 1 in network "(private use)" are causing IP
packets to
be dropped. It is a HTTP server (running Apache/1.3.6 (Unix)
mod_ssl/2.3.11 OpenSSL/0.9.4).

------------------------------------------------------------------------------------------------------------------------------------------------------
| Hop | %Loss | IP Address      | Node Name                          
     | Location          | Tzone  | ms  | Graph      | Network        
       |
------------------------------------------------------------------------------------------------------------------------------------------------------
| 0   |       | 10.0.0.1        | xxxx.local                          
     | ...               |        |     |            | (private use)  
       |
| 1   | 10    | 10.0.0.10       | yyyy.local                          
     | ...               |        | 1   | x          | (private use)  
       |
| 2   | 10    | 195.173.57.14   | anchor-du-14.access.demon.net      
     | -                 |        | 112 |   x-       | Demon Internet
Limited |
| 3   | 10    | 195.173.57.251  | anchor-core-1-fxp3.router.demon.net
     | -                 |        | 106 |  -x        | Demon Internet
Limited |
| 4   | 30    | 194.159.36.226  | anchor-border-1-e31.router.demon.net
     | -                 |        | 107 |   x        | Demon Internet
       |
| 5   | 10    | 195.173.72.17   | lon1-border-1-225.router.demon.net  
     | -                 |        | 109 |   x        | Demon Internet
       |
| 6   | 10    | 194.159.176.125 | lon1-core-11-235.router.demon.net  
     | -                 |        | 110 |   x        | Demon Internet
       |
| 7   | 10    | 194.159.176.98  |
ny1-border-2-x-0-1-1-101.router.demon.net | -                 |      
| 199 |    -x--    | Demon Internet         |
| 8   | 20    | 198.32.160.32   | nyiix-peer1.NYC3.Globix.net        
     | New York, NY, USA |   -5.0 | 204 |    -x--    | 198.32.160.0  
       |
| 9   | 40    | 209.10.12.17    | s3-1-core2.nyc1.globix.net          
     | New York, NY, USA |   -5.0 | 185 |    x-      | 209.10.12.0    
       |
| 10  | 20    | 209.10.11.170   | so-3-0-0.core2.nyc8.globix.net      
     | New York, NY, USA |   -5.0 | 179 |    x-      | 209.10.11.0    
       |
| 11  | 20    | 209.10.10.161   | so-1-0-0.core1.cgx2.globix.net      
     | Chicago, IL, USA  |   -6.0 | 206 |     x      | 209.10.10.0    
       |
| 12  | 30    | 209.10.10.158   | so-0-0-0.core2.cgx2.globix.net      
     | Chicago, IL, USA  |   -6.0 | 200 |     x      | 209.10.10.0    
       |
| 13  | 40    | 209.10.10.149   | so-1-0-0.core1.sjc4.globix.net      
     | San Jose, CA, USA |   -8.0 | 292 |      -x    | 209.10.10.0    
       |
| 14  | 40    | 209.10.11.222   | so-5-3-0.core1.sjc1.globix.net      
     | San Jose, CA, USA |   -8.0 | 274 |      x-    | 209.10.11.0    
       |
| 15  | 30    | 209.10.3.78     | gig3-1-edge1-gw1.sjc1.globix.net    
     | San Jose, CA, USA |   -8.0 | 346 |      --x-- | 209.10.3.0    
       |
| 16  | 20    | 209.10.222.194  | www2.ebay.com                      
     |                   |        | 264 |      x--   | 209.10.222.0  
       |
------------------------------------------------------------------------------------------------------------------------------------------------------
Roundtrip time to www2.ebay.com, average = 264ms, min = 248ms, max =
357ms -- 10-Nov-02 15:17:44

 
 
 

Lost ping packets on home network with masquerading linux machine

Post by Daniel To » Wed, 13 Nov 2002 19:51:58


It gets worse.  I can't actually access www.ebay.co.uk with any web
browser or even telnet www.ebay.co.uk 80 since Saturday morning!  The
modem is a Pace (PMC Consumer Electronics) 56 Voice modem.   Well, I
supposse at least it is saving me money in the long term.

 
 
 

1. No ping response from other (win98) machines on home network, but ICS is triggered?

        I have one Red Hat Linux box I'm trying to intergrate into a
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Tulip driver) Ethernet card appears to be setup correctly as eth0.
I've run through all the FAQs and the setup seems to check out, except
that I don't get a ping response back from any of the windows machines
and Red Hat won't response to the win machines.  However, on one of
the Windows machines I have Internet Connection Sharing set up.
Strangely, when my linux box (only my linux box) tries to ping that
machine, the Connection sharing kicks in the modem and dials into the
network.  I still don't get a ping response, but I must be sending
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