Open Stack

Dear experts,

 

My issue is that:

1.    I set up OpenStack in multi Nodes model, with ML2 Plugin and GRE mode.

2.    I created 2 VMs in the same Compute node. (1 Web and 1 DB).

3.    My App needs fully support packet 1500 Bytes.

 

How can I configure Openstack to do that?

 

----

I already configured:

1.    Set MTU of Ethernet_interface in VM 


 

VM1# ifconfig eth0 mtu 1600

VM2# ifconfig eth0 mtu 1600

 

root at cuong-vm-01:~# netstat -i

Kernel Interface table

Iface   MTU Met   RX-OK RX-ERR RX-DRP RX-OVR    TX-OK TX-ERR TX-DRP TX-OVR Flg

eth0       1600 0     15958      0      0 0         10317      0      0      0 BMRU

lo        65536 0         0      0      0 0             0      0      0      0 LRU

root at cuong-vm-02:~# netstat -i

Kernel Interface table

Iface   MTU Met   RX-OK RX-ERR RX-DRP RX-OVR    TX-OK TX-ERR TX-DRP TX-OVR Flg

eth0       1600 0     15936      0      0 0         10009      0      0      0 BMRU

lo        65536 0         0      0      0 0             0      0      0      0 LRU

 

2.    Set MTU of every port in BR-INT to 1600Bytes


root at controller:~# netstat -i

Kernel Interface table

Iface   MTU Met   RX-OK RX-ERR RX-DRP RX-OVR    TX-OK TX-ERR TX-DRP TX-OVR Flg

br-ex      1500 0     21680      0      0 0          2928      0      0      0 BRU

br-int     1600 0       308      0      0 0             6      0      0      0 BRU

br-tun     1500 0         0      0      0 0             6      0      0      0 BRU

eth0       1500 0    483582      0      2 0         22859      0      0      0 BMPRU

eth1       1500 0       220      0      0 0             6      0      0      0 BMRU

lo        65536 0    174389      0      0 0        174389      0      0      0 LRU

qbr480003c8-57  1500 0        29      0      0 0             6      0      0      0 BMRU

qbr59db81a4-93  1500 0        46      0      0 0             6      0      0      0 BMRU

qvb480003c8-57  1500 0     15907      0      0 0          9877      0      0      0 BMPRU

qvb59db81a4-93  1500 0     15773      0      0 0         10087      0      0      0 BMPRU

qvo480003c8-57  1600 0      9877      0      0 0         15907      0      0      0 BMPRU

qvo59db81a4-93  1600 0     10087      0      0 0         15773      0      0      0 BMPRU

tap480003c8-57  1500 0      9995      0      0 0         15912      0      0      0 BMRU

tap59db81a4-93  1500 0     10169      0      0 0         15764      0      0      0 BMRU

virbr0     1500 0         0      0      0 0             0      0      0      0 BMU

 

However, I clouldn’t ping from VM 01 to VM02 without fragment

root at cuong-vm-01:~# traceroute --mtu 172.16.10.13  

traceroute to 172.16.10.13 (172.16.10.13), 30 hops max, 65000 byte packets

1  * F=1600 * *

2  * * *

3  * * *

4  * *^C

--- 

root at cuong-vm-02:~# ping -s 1500 -M do 172.16.10.12

PING 172.16.10.12 (172.16.10.12) 1500(1528) bytes of data.

 

Thank you very much.

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