From: lzx (sglzx@163.com)
Date: Tue May 23 2006 - 06:32:06 ART
First thx for your reply .but i still don't understand that .
the link you give is talking much more about the tcp transmission .how about
the icmp packets and UDP packets,cause much of the application are based on
the udp ,such as file copy.
On the other hand ,a tunnel will pass through a lot of routers and switchs ,
Wether the 4th solution in the cisco link http://www.cisco.com/warp/public/105/56.html#solutions is practically ?
Another question is after i made these configuration:
int tunnel 0
ip mtu 1530 ---------configured by me
tunnel source x.x.x.
....
i execute the two commands " show int tunnel 0 " and "show ip int tunnel 0" , but the
MTU displayed is different , which one is right?
c6509-r1-gdsz#sho int tunnel 0
Tunnel0 is up, line protocol is up
Hardware is Tunnel
Internet address is 10.10.10.2/30
MTU 1514 bytes, BW 9 Kbit, DLY 500000 usec,
reliability 255/255, txload 27/255, rxload 162/255
Encapsulation TUNNEL, loopback not set
Keepalive not set
Tunnel source 61.242.2.114, destination 61.242.2.250
Tunnel protocol/transport GRE/IP, key disabled, sequencing disabled
Checksumming of packets disabled, fast tunneling enabled
Last input 00:00:00, output 00:41:03, output hang never
Last clearing of "show interface" counters 03:44:20
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 1
Queueing strategy: fifo
Output queue :0/0 (size/max)
5 minute input rate 23000 bits/sec, 11 packets/sec
5 minute output rate 10000 bits/sec, 7 packets/sec
230657 packets input, 47348163 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
131055 packets output, 69863142 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
c6509-r1-gdsz#sho ip int tu
c6509-r1-gdsz#sho ip int tunnel 0
Tunnel0 is up, line protocol is up
Internet address is 10.10.10.2/30
Broadcast address is 255.255.255.255
Address determined by setup command
MTU is 1530 bytes
Helper address is not set
Directed broadcast forwarding is disabled
Outgoing access list is not set
Inbound access list is not set
Proxy ARP is enabled
Local Proxy ARP is disabled
Security level is default
Split horizon is enabled
ICMP redirects are always sent
ICMP unreachables are always sent
ICMP mask replies are never sent
IP fast switching is enabled
IP fast switching on the same interface is disabled
IP Flow switching is disabled
IP CEF switching is enabled
IP Feature Fast switching turbo vector
IP Feature CEF switching turbo vector
IP multicast fast switching is enabled
IP multicast distributed fast switching is disabled
IP route-cache flags are Fast, Distributed, CEF
Router Discovery is disabled
IP output packet accounting is disabled
IP access violation accounting is disabled
TCP/IP header compression is disabled
RTP/IP header compression is disabled
Probe proxy name replies are disabled
Policy routing is disabled
Network address translation is disabled
WCCP Redirect outbound is disabled
WCCP Redirect inbound is disabled
WCCP Redirect exclude is disabled
BGP Policy Mapping is disabled
IP multicast multilayer switching is disabled
c6509-r1-gdsz#
c6509-r1-gdsz#
======= 2006-05-23 08:53:00 DzTZ@4PEVPP45@#:=======
>Hi there,
>
>This does seem like a problem with you packet sizes. Send an extended
>ping sweep of sizes to make sure.
>
>Try dropping the mtu size of the interface to compensate for the
>overhead of the tunnel. The physical MTU of the interface will remain
>the same. Then run the ping sweep again and see how it goes.
>
>LH
>
>lzx wrote:
>> hi,
>> I have met a question about GRE tunnel. When i made a tunnel from 6509 to 76xx,
>> the users whose traffic route through this tunnel complaint that they almost could't
>> open every website on the internet, but they could ping these website's servers.
>> So i trust that is caused by the MTU of the tunnel. Then i changed the mtu of the
>> tunnel interface:
>> int tunnel 0
>> ip mtu 1530
>> ......
>>
>> after did that , i try again , but it still dosen't work. I doubt that if i should
>> change the physical interface of the tunnel using. Dose anyone have some succeed experience? thx a lot!
>>
>> My 6509 is the catos+ios (l2+l3) mix system.
>>
>> ios: Version 12.1(11b)E4
>>
>>
>> !!!!!!!!!!!!!!!!lzx
>> !!!!!!!!!!!!!!!!sglzx@163.com
>> !!!!!!!!!!!!!!!!!!!!2006-05-23
>>
>> _______________________________________________________________________
>> Subscription information may be found at:
>> http://www.groupstudy.com/list/CCIELab.html
>>
>>
>H
= = = = = = = = = = = = = = = = = = = =
!!!!!!!!!!!!!!!!VB
@q#!
!!!!!!!!!!!!!!!!lzx
!!!!!!!!!!!!!!!!sglzx@163.com
!!!!!!!!!!!!!!!!!!!!2006-05-23
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