-1
votes
1answer
50 views

VMWare - Jumbo Frames over iSCSI to a NAS4Free array

I am having problems getting Jumbo Frames working over my iSCSI connection. Here is what I try. 4 1GbE connections on 4 different subnets on my NAS4Free array for iSCSI, MTU set at 9000 2 redunant ...
2
votes
0answers
99 views

Full MTU not utilized with jumbo frames enabled

I've been testing to see if I can get any benefit from enabling jumbo frames. I've set up two identical Dell R210 servers with Xeon quad core E3122 CPUs, 8G of RAM and Broadcom NetXtreme II BCM5716 ...
0
votes
1answer
399 views

What is the right way to temporarily disable/enable PMTU Discovery on a Linux box?

I've a few pcaps that contain packets larger than standard ethernet MTU size of 1500B. I searched about this and found refs pointing towards Jumbo Frames. I now understand that since I'm on a GBE ...
0
votes
1answer
153 views

Jumbo Frame configuration & VMware

I am hoping one of you can help clear up some of my confusion on this matter. We have 2 new catalyst 3750 switches to support our VM hosts and SAN arrays. The SAN arrays utilize jumbo frames with an ...
1
vote
1answer
708 views

Configure LeftHand iSCSI SAN for jumbo frames after clients are configured

This is similar to enabling jumbo frames on an iSCSI network after the fact but in our case we configured the switches and then went through all the hosts, enabling jumbo frames (we may have screwed ...
2
votes
1answer
672 views

VMWare ESXi 4.1 VMXNET Ignoring MTU and Sending Jumbo Frames

On my CentOS 5.6 ESXi 4.1 VMs using VMXNET, it looks like they are attempting to send jumbo frames: However, all the interfaces are set to MTU 1500. What is causing this behavior? Update: I ...
9
votes
5answers
2k views

Are Jumbo Frames (MTU up to 9k) realistic/common over the open Internet?

I've got an application that would benefit from larger Ethernet frames. (In theory, we could reduce the number of outbound packets by > 50%, maybe even 66%.) I'm also in the process of specifying ...