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1answer
150 views

TCP packets larger than 4 KB don't get a reply from Linux

I'm running Linux 3.2.51 in a virtual machine (192.168.33.15). I'm sending Ethernet frames to it. I'm writing custom software trying to emulate a TCP peer, the other peer is Linux running in the ...
1
vote
1answer
144 views

Mixing jumbo frames on Vsphere 5 ISCSI network

We have a HP C7000 blade chassis with a HP Lefthand SAN solution. The ISCSI network is in its own VLAN and is using the standard MTU of 1500. We also have a backup exec 2012 server that has read ...
0
votes
1answer
242 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
130 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 ...
2
votes
1answer
217 views

Mixing jumbo frames and normal frames on one server?

I have a group of servers on 10Gb that I want to use jumbo frames on to hopefully speed up the backups. The backup server and switches can be changed. If I turn on jumbo frames, will all of the ...
1
vote
1answer
47 views

Is it correct to use the term “Jumbo” when referring to any packets > 1500 bytes, even those created in software by LRO

I can be a bit of a stickler for correct terminology at work. Recently we have been dealing with the effects of Large Receive Offload on our application. To quote wikipedia "It works by aggregating ...
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vote
3answers
511 views

Enabling jumbo frames on switch but not on devices: looking for trouble?

The switch at hand is a Dell PowerConnect 2716 which does support both VLANs and Jumbo Frames but, as far as I can understand from its manual, it only has a global Jumbo enable/disable setting and no ...
2
votes
0answers
882 views

Issue with Netgear GS108T Managed Switch and Jumbo Frames

I recently purchased a Netgear GS108T managed switch and I am trying to configure jumbo packets between my NAS (Thecus N4100Pro), PC and managed switch. I should mention the fact that I was able to ...
1
vote
0answers
906 views

Is it possible to mix jumbo frames VLAN and standard mtu VLAN on the same switch port?

If a managed switch and all attached devices both support VLANs and Jumbo Frames, is it possible to mix VLANs with jumbo frames and VLANs with standard frames on the same switch port / ethernet card? ...
3
votes
2answers
686 views

Server 2012, Jumbo Frames - should I expect problems?

Ok, this sound might stupid - but is there any negative on just enabling jumbo frames in practice? From what I understand: Any switch or ethernet adapter that sees a jumbo frame it can not handle ...
1
vote
1answer
558 views

Why is there no autonegotiation for ethernet jumbo frames? [closed]

Having read up a bit about ethernet jumbo frames, I'm wondering. There seem to be technical advantages to being able to use larger than 1500 byte ethernet frames in some cases. Just enabling jumbo ...
4
votes
3answers
2k views

Jumbo Frames, ISCSI and ESXi

I have enabled Jumbo Frames (9000) in ESXi for all my vmNICs, vmKernels, vSwitches, iSCSI Bindings etc - basically anywhere in ESXi where it has an MTU settings I have put 9000 in it. The ports on the ...
0
votes
1answer
2k views

Broadcom BCM5709C Jumbo Frames on Windows 2008R2

I have a broadcom bcm5709c quad port nic (gigabit netxtreme II); I download the broadcom utility from there site, I can setup teaming and all, but I can't seem to find the setting to enable jumbo ...
0
votes
0answers
446 views

gigabit TCP speed cat5e ~270Mbit only (jumbo frames)

Read a lot discussions 'bout the topic and still I can't manage to achieve higher speeds. PassMark Advanced network test shows around 270Mbit max via TCP, in both ways, UDP is around 520Mbit, but my ...
3
votes
1answer
1k views

iSCSI SAN - Network adapter bottleneck

My new database server (Windows Server 2008 R2) has a 4 Gbps connection to my Dell EqualLogic iSCSI SAN. I've been testing it by backing up multiple databases at the same time. There appears to be a ...
1
vote
1answer
629 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 ...
1
vote
2answers
1k views

Jumbo frames with wireless client

I currently have the following network configuration Apple Time Capsule (Gigabit Ethernet router) 2 Windows desktop wired with Gigabit ethernet 1 MacBook Pro in wireless N mode 1 iPhone (obviously ...
2
votes
1answer
625 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 ...
0
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2answers
449 views

Link Aggregation And Jumbo Frames configured but not working

I have a netgear GS110TP smart POE switch which is connected to a dual port INTEL PRO/1000PT with static link aggregation configured on the switch and PC side. The network card and switch recognize ...
-1
votes
1answer
692 views

How to enable jumbo frame and large TCP on Windows Server 2008

I needed to enable the jumbo frame 9000 in network setting, and I have already done that. I still need to enable large TCP on Windows Server 2008, but how do I do that?
21
votes
3answers
14k views

Testing whether jumbo frames are actually working

Is there a command to test whether jumbo frames are actually working? i.e. some sort of "ping" that reports whether or not the packet was broken up along the way. I've an ESXi host with an Ubuntu VM ...
3
votes
2answers
704 views

Enabling Jumbo Packet support on Hyper-V internal network NIC

I have a Hyper-V setup where guest OS'es accesses the host/parent OS via an Internal Network. I've noticed that "Microsoft Virtual Machine Bus Network Adapter" has support for Jumbo Packets and ...
1
vote
1answer
2k views

Missing Jumbo and MTU for Broadcom NIC?

I have two Broadcom BCM5708C NetXtreme II GigE NICs in my Dell Windows SBS 2008 server. I would like make one them them Jumbo Frames enabled so that I can add it to my SAN whose VLAN on the switch is ...
1
vote
2answers
1k views

Cannot increase MTU on gigabit network

I have just set up my new gigabit network and when I was about to increase the MTU to use jumbo frames, I get this error: root@rayquang-desktop:~# ifconfig eth1 mtu 9000 SIOCSIFMTU: Invalid ...
3
votes
2answers
1k views

enabling jumbo frames on an iSCSI network after the fact

We're using iSCSI storage and have two dedicated VLANs for iSCSi. We didn't implement jumbo frames initially. I'd like to turn it on now. I understand I need to turn it on for the NICs that connect to ...
0
votes
3answers
346 views

Implementing jumbo frames on one interface and not the other

I have a distributed application that passes a whole lot of traffic among a number of machines. Currently, those machines share a gigabit network with the rest of the machines in the rack, and I'm ...
1
vote
1answer
2k views

Setup link aggregation and jumbo frames on VMware ESXi 4

I'm setting up an ESXi 4 server to connect to an NFS datastore. I'd like to bond two of the NICs together and use jumbo frames for the NFS connection on a private (non-management) network. I setup a ...
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 ...
5
votes
4answers
297 views

Are there any statistics on the number of networks using Ethernet Jumbo frames?

I am often told by Sales Engineers and Product managers that a Layer 2 Ethernet service is not fit for purpose if the maximum supported frame size is in the 1518-1522 range (enough to support standard ...
2
votes
2answers
3k views

VMWare converter performance

I have a question about my test lab. It's more to understand the concept more than apply this into production: I have an ESXi with few VMs linux/windows configured and I'd like to use VMWare ...
1
vote
4answers
2k views

Should I disable Jumbo Packets on iSCSI network?

Let's say we have a SQL Server 2000 box that houses our main database engine. We added an iSCSI SAN and now that server has a one card connected to the regular network and one card connected to the ...
3
votes
3answers
7k views

Network packet size on sql server connection string to improve throughput

We have a dataload job that moves a relatively large amount of data across the network between two sql servers. the servers are on the same subnet and there is only a switch between them. the data ...
19
votes
5answers
5k views

Upgrading to Gigabit Network - Enabling Jumbo Frames

I would like to begin to upgrade my SOHO network to gigabit (from 10/100) and have heard a bit on Jumbo Frames. What would be the best way to implement Jumbo Frames on a network? From what I can tell ...