search for: mtu

On Sat, May 06, 2023 at 04:56:35PM +0800, Hao Chen wrote: > > > ? 2023/5/6 10:50, Xuan Zhuo ??: > > On Sat, 6 May 2023 10:15:29 +0800, Hao Chen <chenh at yusur.tech> wrote: > > > When VIRTIO_NET_F_MTU(3) Device maximum MTU reporting is supported. > > > If offered by the device, device advises driver about the value of its > > > maximum MTU. If negotiated, the driver uses mtu as the maximum > > > MTU value. But there the driver also uses it as default mtu, > > &gt...

Hi, experts for example, the below case: You can see a lot of back and forth MTU probe packets been exchanged between tinc nodes, but it’s weird that, from the debug log, one line shows "No response to MTU probes from node1”, but it indeed received a lot of MTU probe response, and finally it get the conclusion of "Packet for node1 (1.1.1.1 port 443) larger than minimu...

The following series adds the ability for a hypervisor to set an MTU on the guest during feature negotiation phase. This is useful for VM orchestration when, for instance, tunneling is involved and the MTU of the various systems should be homogenous. The first patch adds the feature bit as described in the proposed VFIO spec addition found at https://lists.oasis-op...

The following series adds the ability for a hypervisor to set an MTU on the guest during feature negotiation phase. This is useful for VM orchestration when, for instance, tunneling is involved and the MTU of the various systems should be homogenous. The first patch adds the feature bit as described in the proposed VFIO spec addition found at https://lists.oasis-op...

I found the server(1.1.1.1) didn’t receive the MTU probe from client, so I add iptables -A INPUT -p udp —port 443 -j ACCEPT. After this, I see one packet matching on the server side, and the MTU negotiation works, but when I tear down the tinc, and re-establish the tinc connection, the counter of below UDP/443 never increase, and also my other tin...

From: Aaron Conole <aconole at bytheb.org> The virtio committee recently ratified a change, VIRTIO-152, which defines the mtu field to be 'max' MTU, not simply desired MTU. This commit brings the virtio-net device in compliance with VIRTIO-152. Additionally, drop the max_mtu branch - it cannot be taken since the u16 returned by virtio_cread16 will never exceed the initial value of max_mtu. Cc: "Michael S....

Hi all I try to use tinc within my network, but I find almost all mtu probe take 30 times to fix, it's never really fix at all. after read code, i think the problem case by function receive_udppacket(); and line : origin -= MTU / 64 + 20; here , MTU / 64 + 20 =43, this means, every time we send a mtu probe packet, we get a reply smaller then what we send. rev...

From: Aaron Conole <aconole at bytheb.org> The virtio committee recently ratified a change, VIRTIO-152, which defines the mtu field to be 'max' MTU, not simply desired MTU. This commit brings the virtio-net device in compliance with VIRTIO-152. Additionally, drop the max_mtu branch - it cannot be taken since the u16 returned by virtio_cread16 will never exceed the initial value of max_mtu. Cc: "Michael S....

Hi, I have an XCP 0.5 box running a few DomUs some of the DomU''s data is stored at (clustered lvm volumes on) a Coraid etherdrive box which is connected via an Ethernet cable to a dedicated card of the XCP box, for which in the network config I'' ve specified: MTU=9344: xe network-param-list uuid=.... gives: MTU ( RW): 9344 on the DomUs if I leave the MTU at 1500 (default settings) everything works (slowly, but works). If I increase the MTU the aoe device appear as expected, but the data on it becomes inaccessible, even just trying to activate the lvm volume...

I have a bridge that has gigabit interfaces. The machine in question has the fun job of being a Bridge, Firewall and SMB server. Both of the Gigabit interfaces are connected to workstations directly via Xover cable (well MDI-X to be exact). My question is, if I enable jumbo frames on the gigabit interfaces will that make any difference in overall transfer rate of the bridge? I was thinking it

The following series adds the ability for a hypervisor to set an MTU on the guest during feature negotiation phase. This is useful for VM orchestration when, for instance, tunneling is involved and the MTU of the various systems should be homogenous. The first patch adds the feature bit as described in the proposed VFIO spec addition found at https://lists.oasis-op...

The following series adds the ability for a hypervisor to set an MTU on the guest during feature negotiation phase. This is useful for VM orchestration when, for instance, tunneling is involved and the MTU of the various systems should be homogenous. The first patch adds the feature bit as described in the proposed VFIO spec addition found at https://lists.oasis-op...

On Sat, 6 May 2023 10:15:29 +0800, Hao Chen <chenh at yusur.tech> wrote: > When VIRTIO_NET_F_MTU(3) Device maximum MTU reporting is supported. > If offered by the device, device advises driver about the value of its > maximum MTU. If negotiated, the driver uses mtu as the maximum > MTU value. But there the driver also uses it as default mtu, > some devices may have a maximum MTU gr...

On Sat, May 06, 2023 at 10:15:29AM +0800, Hao Chen wrote: > When VIRTIO_NET_F_MTU(3) Device maximum MTU reporting is supported. > If offered by the device, device advises driver about the value of its > maximum MTU. If negotiated, the driver uses mtu as the maximum > MTU value. But there the driver also uses it as default mtu, > some devices may have a maximum MTU gr...

In general if no MTU is set on interface creation the default value is 1500. On OVS the bridge MTU is automatically set to the smallest port MTU. So you just have to set the MTU of each port of the bridge. Take a look at: https://bugzilla.redhat.com/show_bug.cgi?id=1160897 It is a bit of a pain to read but seems to...

...y modified script and output logfile, note that my computer has two network interfaces - eth0 and eth1 Alex. -------------- next part -------------- Sat May 3 21:34:34 EDT 2008 Network bridge values: 'start' *****IP link parameters before script import 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000 link/ether 00:80:2d...

hyperv_net: - set min/max_mtu virtio_net: - set min/max_mtu - remove virtnet_change_mtu vmxnet3: - set min/max_mtu CC: netdev at vger.kernel.org CC: virtualization at lists.linux-foundation.org CC: "K. Y. Srinivasan" <kys at microsoft.com> CC: Haiyang Zhang <haiyangz at microsoft.com> CC: "Michael...

hyperv_net: - set min/max_mtu virtio_net: - set min/max_mtu - remove virtnet_change_mtu vmxnet3: - set min/max_mtu CC: netdev at vger.kernel.org CC: virtualization at lists.linux-foundation.org CC: "K. Y. Srinivasan" <kys at microsoft.com> CC: Haiyang Zhang <haiyangz at microsoft.com> CC: "Michael...

Hi Michal, Thanks for your answer. I don’t understand why an interface created without mtu gets only 1500 visible in the virtual machine but if I create an interface with mtu higher than 1500 e.g. 2000 the bridge will change too. Before the bridge was e.g. by 9000. I ask because you wrote if I don’t set an mtu of the interface I will get the mtu of the bridge. But it seems so. Can you c...

On 6 May 2023 09:56:35 BST, Hao Chen <chenh at yusur.tech> wrote: >In the current code, if the maximum MTU supported by the virtio net hardware is 9000, the default MTU of the virtio net driver will also be set to 9000. When sending packets through "ping -s 5000", if the peer router does not support negotiating a path MTU through ICMP packets, the packets will be discarded. That router is jus...