Date: Wed, 17 Dec 2008 16:35:39 +0800 From: "Rommel Laranjo" <rslaranjo@gmail.com> Subject: [users:01051] Re: Question about IPv6 Ready Phase 2 Interoperability To: users@tahi.org Message-Id: <f051005f0812170035ya68026anfa337b89311c7ef9@mail.gmail.com> In-Reply-To: <f051005f0812170030q53cf0ef1r8b6bbae4215a06e0@mail.gmail.com> References: <f051005f0812161905t3371c3a5w888cc10bd85fcd9b@mail.gmail.com> <494873F0.7050408@redhat.com> <f051005f0812161949ud67991ch5402979c92a616a6@mail.gmail.com> <ba28e1060812162131q181d9a78q37aa7402b0cac87e@mail.gmail.com> <f051005f0812170030q53cf0ef1r8b6bbae4215a06e0@mail.gmail.com> X-Mail-Count: 01051I have another problem, does anyone here knows some issues about Ubuntu 8.04 PMTU? It seems that it will not send Packet too big packet. :( On Wed, Dec 17, 2008 at 4:30 PM, Rommel Laranjo <rslaranjo@gmail.com> wrote: > > > On Wed, Dec 17, 2008 at 1:31 PM, TCP IP <tcp.ip.ip6@gmail.com> wrote: > >> >> Hello, >> >> Even when i test i got 33% of packet loss., but i think that is worng. >> becuse the n/w topology looks as follows. >> >> MC1 >> | >> ----------+------------+--------------------- N/W1 MTU 1500 >> | >> MC2 >> | >> ---------+----------------+-------------------- N/W2 MTU 1280 >> | >> MC3 >> | >> -----+-------------------+----------------------- N/W3 MTU 1500 >> | >> MC4 >> >> In script we ping 3 time from MC4 to MC1 as follows. >> Ping -c 1 -c 1452 MC1 ( 100% packet loss) >> Ping -c 1 -c 1452 MC1 ( 100% packet loss) >> Ping -c 3-c 1452 MC1 ( 33% packet loss) >> >> >> Yes, 1st ping will get too big messge from MC3 and MC4 will reduce its PMTU to 1280. >> and 2nd ping will reach MC1. The MC1 will try to reply with MTU 1500, so >> it also will get Too big message from MC2.( 2packet lost ) > > I think MC1 can get PMTU from the first ICMPv6 Echo request that it received so it will not get Packet too big from MC2 when it sends its reply. > >> >> Now, MC1 and MC4 knows it PMTU, the last ping has to 0 % packet loss >> right? >> >> Am i missiing anything here? >> >> >> >> >> >> >> On 12/17/08, Rommel Laranjo <rslaranjo@gmail.com> wrote: >>> >>> Thank you so much wang_jiabo for your reply. So now I think there is >>> something wrong with my setup cause I experience huge percentage of packet >>> drop. >>> From my packet sniff on Network1, I've seen several ICMPv6 Echo reply but >>> only few were received by TAR-Router1. >>> >>> Thanks alot, >>> >>> Rommel >>> >>> >>> >>> On Wed, Dec 17, 2008 at 11:37 AM, wang_jiabo <jiabwang@redhat.com>wrote: >>> >>>> Hello, Rommel Laranjo: >>>> my test result for 1.6 part D: >>>> >>>> Rommel Laranjo ping6 -I eth0 -c 3 -s 1500 3ffe:501:ffff:104::1 > >>>> 1.6.D.RedHat.Cisco.result >>>> >>>> PING 3ffe:501:ffff:104::1(3ffe:501:ffff:104::1) from >>>> 3ffe:501:ffff:100:210:18ff:fe32:56e2 eth0: 1500 data bytes >>>> From 3ffe:501:ffff:100::1 icmp_seq=0 Packet too big: mtu=1280 >>>> 1508 bytes from 3ffe:501:ffff:104::1: icmp_seq=1 ttl=62 time=2.06 ms >>>> 1508 bytes from 3ffe:501:ffff:104::1: icmp_seq=2 ttl=62 time=2.13 ms >>>> >>>> --- 3ffe:501:ffff:104::1 ping statistics --- >>>> 3 packets transmitted, 2 received, +1 errors, 33% packet loss, time >>>> 2000ms >>>> rtt min/avg/max/mdev = 2.061/2.100/2.139/0.039 ms, pipe 2 >>>> >>>> >>>> [H3CMSR2020]ping ipv6 -s 1500 3ffe:501:ffff:100:210:18ff:fe32:56e2 >>>> PING 3ffe:501:ffff:100:210:18ff:fe32:56e2 : 1500 data bytes, press >>>> CTRL_C to break >>>> Reply from 3FFE:501:FFFF:100:210:18FF:FE32:56E2 >>>> bytes=1500 Sequence=1 hop limit=62 time = 2 ms >>>> Reply from 3FFE:501:FFFF:100:210:18FF:FE32:56E2 >>>> bytes=1500 Sequence=2 hop limit=62 time = 2 ms >>>> Reply from 3FFE:501:FFFF:100:210:18FF:FE32:56E2 >>>> bytes=1500 Sequence=3 hop limit=62 time = 3 ms >>>> Reply from 3FFE:501:FFFF:100:210:18FF:FE32:56E2 >>>> bytes=1500 Sequence=4 hop limit=62 time = 3 ms >>>> Reply from 3FFE:501:FFFF:100:210:18FF:FE32:56E2 >>>> bytes=1500 Sequence=5 hop limit=62 time = 3 ms >>>> >>>> --- 3ffe:501:ffff:100:210:18ff:fe32:56e2 ping statistics --- >>>> 5 packet(s) transmitted >>>> 5 packet(s) received >>>> 0.00% packet loss >>>> round-trip min/avg/max = 2/2/3 ms >>>> >>>> I hope this can help you. >>>> jiabo >>>> >>>> Hello to all tahi users, >>>>> >>>>> I know this post is not related to using the TAHI script because I'm >>>>> doing manual IPv6 Interoperability Testing. >>>>> But I just hope someone would be kind enough to share their expert >>>>> knowledge about Interoperability Testing. >>>>> >>>>> I am now performing Test IP6Interop.1.6: Path MTU Discovery and >>>>> Fragmentation Part D steps 23 to 27. My question is this, is it normal to >>>>> see packet loss about 90% or sometimes 80% when I ping from TAR-Router1 to >>>>> TAR-Host1 ? and from TAR-Host1 to TAR-Router1 ? >>>>> If there would be packet loss, how much would be the expected value? >>>>> I gladly appreciate your replies. >>>>> >>>>> >>>>> Thanks, >>>>> >>>>> Rommel >>>>> >>>>> >>>> >>>> >>> >> >1051_2.html (attatchment)(tag is disabled)