[6bone] Problems with big packets!?

Fri, 4 Oct 2002 23:57:32 +0200

Alvero,

Your system undoubtedly has to fragment the data. After all the path 
MTU size is most likely smaller than 5000 bytes.

I suggest you have a look at the packets (using tcpdump, ethereal or 
some other fancy analyzer). You probably will see ICMPv6 Time Exceeded 
messages, telling that the fragment reassembly time is exceeded.

Kind regards, Arien

On vrijdag, oktober 4, 2002, at 12:40 PM, Alvaro Vives wrote:

> Hi all,
>
> We've a host connected to 6BONE through a tunnel. The traceroute6 and 
> ping6
> to 3ffe:3328:6:2b01::a100 works fine, BUT if we try:
>
> #ping6 -s 5000 3ffe:3328:6:2b01::a100
>
> ALL the packets are lost! (-s specifies the size in bytes).
>
> We tried ping6 (-s 5000 & -s 1000) to each node in the route, and in 
> one of
> them seems to be the problem:
>
> 2001:660:1102:4007::2
>
> Somebody else have experienced this?
>
> Regards,
>
> Alvaro.
>
> Se the pings and traceroute below:
>
> # ping6 -s 1000 3ffe:3328:6:2b01::a100
> PING 3ffe:3328:6:2b01::a100(3ffe:3328:6:2b01::a100) from
> 2001:470:1f00:ffff::213 : 1000 data bytes
> 1008 bytes from 3ffe:3328:6:2b01::a100: icmp_seq=0 hops=58 
> time=843.811 msec
> 1008 bytes from 3ffe:3328:6:2b01::a100: icmp_seq=1 hops=58 
> time=878.117 msec
> 1008 bytes from 3ffe:3328:6:2b01::a100: icmp_seq=2 hops=58 
> time=858.146 msec
>
> --- 3ffe:3328:6:2b01::a100 ping statistics ---
> 3 packets transmitted, 3 packets received, 0% packet loss
>
>
> # ping6 -s 5000 3ffe:3328:6:2b01::a100
> PING 3ffe:3328:6:2b01::a100(3ffe:3328:6:2b01::a100) from
> 2001:470:1f00:ffff::213 : 5000 data bytes
>
> --- 3ffe:3328:6:2b01::a100 ping statistics ---
> 7 packets transmitted, 0 packets received, 100% packet loss
> ------------------------------------------
> # traceroute6 3ffe:3328:6:2b01::a100
> traceroute to 3ffe:3328:6:2b01::a100 (3ffe:3328:6:2b01::a100) from
> 2001:470:1f00:ffff::213, 30 hops max, 16 byte packets
>  1  viperpan.tunnel.tserv1.fmt.ipv6.he.net (2001:470:1f00:ffff::212)
> 338.498 ms  287.976 ms  274.952 ms
>  2  rtr1.ipv6.he.net (3ffe:81d0:ffff::2)  279.843 ms  278.591 ms  
> 259.885 ms
>  3  3ffe:8070:1:13::1 (3ffe:8070:1:13::1)  359.978 ms  384.063 ms *
>  4  2001:660:1102:4007::2 (2001:660:1102:4007::2)  625.084 ms  534.236 
> ms
> 499.932 ms
>  5  3ffe:3300::29:2 (3ffe:3300::29:2)  839.862 ms  759.19 ms  744.743 
> ms
>  6  3ffe:3328:6:2::4 (3ffe:3328:6:2::4)  799.886 ms  749.333 ms  
> 885.018 ms
>  7  3ffe:3328:6:3::2 (3ffe:3328:6:3::2)  729.746 ms  749.217 ms  
> 704.883 ms
>  8  3ffe:3300::28:a (3ffe:3300::28:a)  704.972 ms  719.274 ms  689.917 
> ms
>  9  3ffe:3328:6:2b01::a100 (3ffe:3328:6:2b01::a100)  754.837 ms  
> 729.23 ms
> 839.888 ms
> ------------------------------------------
> # ping6 -s 1000 2001:470:1f00:ffff::212
> PING 2001:470:1f00:ffff::212(2001:470:1f00:ffff::212) from
> 2001:470:1f00:ffff::213 : 1000 data bytes
> 1008 bytes from 2001:470:1f00:ffff::212: icmp_seq=0 hops=64 
> time=341.984
> msec
> 1008 bytes from 2001:470:1f00:ffff::212: icmp_seq=1 hops=64 
> time=367.666
> msec
> 1008 bytes from 2001:470:1f00:ffff::212: icmp_seq=2 hops=64 
> time=417.688
> msec
>
> --- 2001:470:1f00:ffff::212 ping statistics ---
> 3 packets transmitted, 3 packets received, 0% packet loss
>
>
> # ping6 -s 5000 2001:470:1f00:ffff::212
> PING 2001:470:1f00:ffff::212(2001:470:1f00:ffff::212) from
> 2001:470:1f00:ffff::213 : 5000 data bytes
> 5008 bytes from 2001:470:1f00:ffff::212: icmp_seq=0 hops=64 
> time=478.822
> msec
> 5008 bytes from 2001:470:1f00:ffff::212: icmp_seq=1 hops=64 
> time=492.336
> msec
> 5008 bytes from 2001:470:1f00:ffff::212: icmp_seq=2 hops=64 
> time=492.383
> msec
> 5008 bytes from 2001:470:1f00:ffff::212: icmp_seq=3 hops=64 
> time=392.413
> msec
>
> --- 2001:470:1f00:ffff::212 ping statistics ---
> 4 packets transmitted, 4 packets received, 0% packet loss
> ------------------------------------------
> # ping6 -s 1000 3ffe:81d0:ffff::2
> PING 3ffe:81d0:ffff::2(3ffe:81d0:ffff::2) from 2001:470:1f00:ffff::213 
> :
> 1000 data bytes
> 1008 bytes from 3ffe:81d0:ffff::2: icmp_seq=0 hops=63 time=271.892 msec
> 1008 bytes from 3ffe:81d0:ffff::2: icmp_seq=1 hops=63 time=460.268 msec
> 1008 bytes from 3ffe:81d0:ffff::2: icmp_seq=2 hops=63 time=310.296 msec
>
> --- 3ffe:81d0:ffff::2 ping statistics ---
> 3 packets transmitted, 3 packets received, 0% packet loss
>
>
> # ping6 -s 5000 3ffe:81d0:ffff::2
> PING 3ffe:81d0:ffff::2(3ffe:81d0:ffff::2) from 2001:470:1f00:ffff::213 
> :
> 5000 data bytes
> 5008 bytes from 3ffe:81d0:ffff::2: icmp_seq=0 hops=63 time=536.436 msec
> 5008 bytes from 3ffe:81d0:ffff::2: icmp_seq=1 hops=63 time=651.132 msec
> 5008 bytes from 3ffe:81d0:ffff::2: icmp_seq=2 hops=63 time=511.162 msec
>
> --- 3ffe:81d0:ffff::2 ping statistics ---
> 3 packets transmitted, 3 packets received, 0% packet loss
> ------------------------------------------
> # ping6 -s 1000 3ffe:8070:1:13::1
> PING 3ffe:8070:1:13::1(3ffe:8070:1:13::1) from 2001:470:1f00:ffff::213 
> :
> 1000 data bytes
> 1008 bytes from 3ffe:8070:1:13::1: icmp_seq=0 hops=62 time=454.961 msec
> 1008 bytes from 3ffe:8070:1:13::1: icmp_seq=1 hops=62 time=525.919 msec
> 1008 bytes from 3ffe:8070:1:13::1: icmp_seq=2 hops=62 time=505.954 msec
>
> --- 3ffe:8070:1:13::1 ping statistics ---
> 3 packets transmitted, 3 packets received, 0% packet loss
>
>
> # ping6 -s 5000 3ffe:8070:1:13::1
> PING 3ffe:8070:1:13::1(3ffe:8070:1:13::1) from 2001:470:1f00:ffff::213 
> :
> 5000 data bytes
> 5008 bytes from 3ffe:8070:1:13::1: icmp_seq=0 hops=62 time=634.059 msec
> 5008 bytes from 3ffe:8070:1:13::1: icmp_seq=1 hops=62 time=653.610 msec
>
> --- 3ffe:8070:1:13::1 ping statistics ---
> 2 packets transmitted, 2 packets received, 0% packet loss
> ------------------------------------------
> # ping6 -s 1000 2001:660:1102:4007::2
> PING 2001:660:1102:4007::2(2001:660:1102:4007::2) from
> 2001:470:1f00:ffff::213 : 1000 data bytes
> 1008 bytes from 2001:660:1102:4007::2: icmp_seq=0 hops=60 time=568.278 
> msec
> 1008 bytes from 2001:660:1102:4007::2: icmp_seq=1 hops=60 time=578.146 
> msec
> 1008 bytes from 2001:660:1102:4007::2: icmp_seq=2 hops=60 time=534.845 
> msec
>
> --- 2001:660:1102:4007::2 ping statistics ---
> 3 packets transmitted, 3 packets received, 0% packet loss
>
>
> # ping6 -s 5000 2001:660:1102:4007::2
> PING 2001:660:1102:4007::2(2001:660:1102:4007::2) from
> 2001:470:1f00:ffff::213 : 5000 data bytes
>
> --- 2001:660:1102:4007::2 ping statistics ---
> 13 packets transmitted, 0 packets received, 100% packet loss
> ------------------------------------------
>
>
>
> ***********************************************************
> Madrid 2002 Global IPv6 Summit
> See all the documents on line at:
> www.ipv6-es.com
>
>
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