Dropping packets??

Ron Wickersham rjw at alembic.com
Mon Feb 4 13:13:54 PST 2002 

hi Chris,

i've see that duplication on lots of small routers...but it does answer
correctly as the gateway:

here the tail of a traceroute to .226:

15  POS1-0.XR2.PAO1.ALTER.NET (152.63.54.78)  58.096 ms  97.235 ms  101.755 ms
16  188.at-3-1-0.HR1.PAO1.ALTER.NET (152.63.54.197)  138.616 ms  104.596 ms  119.305 ms
17  324.ATM2-0.VR1.PAO1.ALTER.NET (152.63.54.249)  132.799 ms  109.168 ms  108.451 ms
18  63.113.184.226 (63.113.184.226)  105.086 ms  85.438 ms  84.003 ms
19  63.113.184.226 (63.113.184.226)  146.269 ms  112.785 ms  82.401 ms

with the duplication (and some congestion prolly nearer me than u)

but to the gateway address .225:

15  POS1-0.XR2.PAO1.ALTER.NET (152.63.54.78)  62.984 ms  76.486 ms  68.966 ms
16  188.at-3-1-0.HR1.PAO1.ALTER.NET (152.63.54.197)  65.381 ms  73.192 ms  60.112 ms
17  324.ATM2-0.VR1.PAO1.ALTER.NET (152.63.54.249)  65.348 ms  90.547 ms  75.213 ms
18  63.113.184.225 (63.113.184.225)  70.325 ms  193.018 ms  146.286 ms

no duplication.

but to a non-responding host, the router is responding with the target
address .228:

S1-0.XR2.PAO1.ALTER.NET (152.63.54.78)  50.854 ms  68.145 ms  50.597 ms
16  188.at-3-0-0.HR1.PAO1.ALTER.NET (152.63.54.205)  61.910 ms  42.027 ms  76.351 ms
17  324.ATM2-0.VR1.PAO1.ALTER.NET (152.63.54.249)  65.364 ms  86.443 ms  76.370 ms
18  63.113.184.228 (63.113.184.228)  102.191 ms  94.241 ms  98.186 ms
19  * * *
20  * * *

################

it's not nice, but i see a lot of this behavior where the gateway device
doesn't respond with its own address unless it is the terminal address.
from the inside of the netblock, it looks normal.  so it's not you and
not just netopia but it doesn't explain the original problem.

the arin swip record shows uunet while the traceroute show alter.net but
that's business these days:

UUNET Technologies, Inc. (NETBLK-UUNET63) UUNET63   63.64.0.0 - 63.127.255.255
packagin (NETBLK-UU-63-113-184-224)
        25 TIBURON ST
        San Rafael, CA 94901-4721
        US

        Netname: UU-63-113-184-224
        Netblock: 63.113.184.224 - 63.113.184.255

        Coordinator:
           GOLDMAN, MARK  (MG739-ARIN)  markg at pacaids.com
           (415.454.4868) X135-

        Record last updated on 16-Aug-2000.
        Database last updated on  3-Feb-2002 19:56:11 EDT.


-ron


On Mon, 4 Feb 2002, Christopher Wagner wrote:

> eth0      Link encap:Ethernet  HWaddr 00:A0:24:45:69:3C
>           inet addr:63.113.184.226  Bcast:63.113.184.255
> Mask:255.255.255.224
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:649492 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:625117 errors:0 dropped:0 overruns:0 carrier:1
>           collisions:1934 txqueuelen:100
>           RX bytes:116836716 (111.4 Mb)  TX bytes:108847427 (103.8 Mb)
>           Interrupt:5 Base address:0x220
> 
> eth0:0    Link encap:Ethernet  HWaddr 00:A0:24:45:69:3C
>           inet addr:63.113.184.227  Bcast:63.113.184.255
> Mask:255.255.255.224
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           Interrupt:5 Base address:0x220
> 
> lo        Link encap:Local Loopback
>           inet addr:127.0.0.1  Mask:255.0.0.0
>           UP LOOPBACK RUNNING  MTU:16436  Metric:1
>           RX packets:2544628 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:2544628 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0
>           RX bytes:113526543 (108.2 Mb)  TX bytes:113526543 (108.2 Mb)
> 
> --
> That is an awfully strange replication..  It does it from Sonic.net, too..
> So there is some kind of misconfiguration on either my box or my Netopia
> router..  Although I followed their instructions for configuring the
> router..  Weird.
> 
> - Christopher Wagner
> chrisw at pacaids.com
> 
> Packaging Aids Corporation - Information Systems
> P.O. Box 9144
> San Rafael, CA 94912-9144
> http://www.pacaids.com/
> (415) 454-4868 x116
> 
> 
> -----Original Message-----
> From: Christopher White [mailto:cwhite at softquad.com]
> Sent: Friday, February 01, 2002 6:00 PM
> To: 'talk at nblug.org'
> Subject: RE: Dropping packets??
> 
> 
> You've got a strange duplication at the end of this traceroute:
> 
> tophat:~# traceroute 63.113.184.226
> traceroute to 63.113.184.226 (63.113.184.226), 30 hops max, 38 byte packets
>  1  atg-router (216.210.204.209)  0.779 ms  0.725 ms  0.613 ms
>  2  64-42-94-1.atgi.net (64.42.94.1)  17.130 ms  15.618 ms  17.047 ms
>  3  gig00.cr1.snrsca16.atgi.net (206.58.248.71)  17.706 ms  17.599 ms
> 17.234 ms
>  4  atm401.cr1.snrfca15.atgi.net (64.42.101.5)  18.146 ms
> atm401.cr1.cncrca14.atgi.net (216.210.139.2)  18.468 ms
> atm401.cr1.snrfca15.atgi.net (64.42.101.5)  107.854 ms
>  5  Serial3-9.GW9.PAO1.ALTER.NET (157.130.212.113)  20.700 ms  20.546 ms
> se11.cr1.paixpa.atgi.net (64.42.101.58)  21.530 ms
>  6  Serial3-9.GW9.PAO1.ALTER.NET (157.130.212.113)  21.370 ms  21.088 ms
> 20.689 ms
>  7  136.ATM3-0.XR1.PAO1.ALTER.NET (152.63.52.194)  22.421 ms  21.353 ms
> 22.142 ms
>  8  189.at-3-0-0.HR1.PAO1.ALTER.NET (152.63.54.193)  20.896 ms  20.743 ms
> 26.401 ms
>  9  324.ATM2-0.VR1.PAO1.ALTER.NET (152.63.54.249)  25.629 ms  37.328 ms
> 32.634 ms
> 10  63.113.184.226 (63.113.184.226)  40.726 ms  40.008 ms  40.901 ms
> 11  63.113.184.226 (63.113.184.226)  41.952 ms  261.623 ms  42.909 ms
> 
> Perhaps there is some misconfiguration on your box.  Can you do an ifconfig
> and paste it into a message?
> 
> Anyone else know anything about this?
> 
>

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