search for: mtus

Hi all, With help from others, I''ve been able to get Olaf''s patch for enabling MTUs >1500 for vifX.y and tapZ devices working. I''ve been able to boot dom0, launch domU and live-migrate without having the bridge''s MTU degrade at any time. Would the Xen RPM maintainers (and others) mind taking a look at the following patches? Kernel part: https://bugzilla.re...

On Mon, Feb 26, 2018 at 5:17 PM, Kip Warner <kip at thevertigo.com> wrote: > Hey list, > > I've read the man page for both the client and server daemon, so either > I missed something or this isn't an SSH issue but something going on > with perhaps routers or MTUs. > > I am having problems with already established connections to a remote > server timing out after a few minutes. Is one end or the other behind a NAT of some kind? -- Nathan

..., I was surprised to discover although I had two seemingly identical Realtek PCI-E nics, the sending NIC could only go up to 4K. I'm wondering, that since Jumbo Frames was supposed to be better for bulk transfers, why am I seeing these results? Is it the ElRepo drivers I used to enable higher MTUs or possibly some kind of oddity with the realtek NICs I am using? Or am I mistaken about the benefits of jumbo frames and that they are only beneficial in specific configurations, perhaps only with higher network speeds and enough packets at 1500 MTU to overwhelm packet handling hardware?

Hey, On Mon, Feb 27, 2012 at 10:26 PM, Linus van Geuns <linus@vangeuns.name> wrote: > Hey, > > I am currently considering a two machine Xen setup based on AMD Opterons, > more precisely Dell R515s or R415s with dual Opteron 4274HE. > Does anyone has some Xen setup(s) running on top of Opterons 4274HE, Opteron > 4200 or Dell R515 machines and is willing to share some

...y. However, the firewall policy doesn't limit anything (and wouldn't it break Windows too?) Does this ring any bells with anyone? The firewalls are Juniper Netscreens at both ends, for what it's worth. I've had a google around, and I can't see anything related to packet size or MTUs, which is what it smells like to me... (presumably the 9th filename ends up in a second packet, or a certain sized response). Thanks in advance for any pointers, Howie

...sshpam_thread_cleanup entering debug1: session_pty_cleanup: session 0 release /dev/pts/23 Feedback on one of the FreeBSD forums suggested that the MTU on the routers might be less than what the machines was using, and that excessive fragmentation might be causing the connection to die. The router MTUs were 1492, and the system MTUs were 1500. Unfortunately, reducing the systems' MTUs to 1400 did not affect the problem but at least I have less fragmentation now. I've tried every config option and commandline switch that looked even remotely related, but nothing has affected it. -ddd -v...

Hi all, I want to set the advertised value of MTU for virbr0 interface on a Fedora 21 host to 1454 to accommodate the installation of new VMs for testing purposes. The aforementioned host is an OpenStack VM actually, which explains the need for a lower than 1500 MTU. I noticed Pieter Hollants' patch to set dhcp-option=<number>,"<value>" for an interface, but

http://bugzilla.mindrot.org/show_bug.cgi?id=792 Summary: mtu and NAT wrong solution Product: Portable OpenSSH Version: -current Platform: All OS/Version: Linux Status: NEW Severity: major Priority: P4 Component: Miscellaneous AssignedTo: openssh-bugs at mindrot.org ReportedBy:

...ets below ip >level, the other end - your ISP/teleco , will need to be running >software that knows what you are doing so that it can reconstruct the >packets before routing. > >If you have a specific need for your upstream not to be delayed more >than X ms you could adjust your MTUs/MSS clamp - the size will depend on >your bitrate and max delay required. > >Andy. > > > = = = = = = = = = = = = = = = = = = = = 　　Regards. 　　　　　　　　swcims 　　　　　　　　swcims@163.com 　　　　　　　　　　2004-05-31

Greetings... ** Short Description / Abstract ** Using my _internal_ WiFi card, OpenSSH succeeds to local (internal) LAN hosts, but hangs after authentication to external LAN hosts; however PuTTY works for all hosts. Using an _external_ WiFi card, OpenSSH does succeed to all LAN hosts (as did PuTTY, still, as well). ** Longer Description and Details ** *** HW Description *** I have a laptop

http://bugzilla.mindrot.org/show_bug.cgi?id=277 ------- Additional Comments From stevesk at pobox.com 2002-06-15 14:19 ------- i don't know what this is: debug1: Credentials Expired debug1: proxy expired: run grid-proxy-init or wgpi first File=/tmp/x509up_u500

...actually process comments in the header and odd alignments of the various parameters, as well as "plain" (not raw) files and PBM and PGM files. * PXELINUX: Lower the default MTU to 1472 in order to deal with systems with slightly nonstandard MTUs, and PXE stacks which don't defragment correctly. Unfortunately this is very hard to test dynamically. Begin3 Title: syslinux Version: 2.06 Entered-date: 2003-08-22 Description: SYSLINUX is a collection of boot loaders for the Linux...

Very rarely, but it has repeated, we see openssh on the client side hanging. On the server side there is no indication of connection in the logs. These are always scripted remote commands that do not have user interaction when we find it. This seems to be happening only in vm environments but I could be wrong. It seems surprising to me that there would not be timeouts and retries on the protocol,

...6 - Xen_domU-IPv6(via_bridge with eth interface set into promiscuous mode) - WRITE OK, READ 20-25Bytes/s !!! 6) Linux_server_IPv6 (regadless bare metal, dom0 or domU) - - Xen_domU-IPv6(via_bridge) - ALL FINE All mounts use NFS version 3 and proto tcp6. We checked MTUs - everywhere 1500. No errors on any side (switch, netapp, linux clients)... IPv4 connections performs just fine. ssh/scp and others IPv6 services perform OK ... Any hints? We think of throwing Xen away :-/ Kind regards, Grzegorz

...A future commit will add proper error handling. Instead, a >> warning is emitted if the guest changes the device MTU after previously >> being given advice. > > One of the things I've been doing has been setting-up a cluster > (OpenStack) with JumboFrames, and then setting MTUs on instance vNICs > by hand to measure different MTU sizes. It would be a shame if such a > thing were not possible in the future. Keeping a warning if shrinking > the MTU would be good, leave the error (perhaps) to if an attempt is > made to go beyond the advised value. This was cut...

...ltered MTU to domains. Does this virbr0 come from the default libvirt network? If so, I am afraid there's no way how to specify MTU. What you could do, is to define <interface/> [1] and then bridged <network/> [2] that will use the interface. Libvirt already has support for setting MTUs for host interfaces. Michal 1: http://libvirt.org/git/?p=libvirt.git;a=blob;f=tests/interfaceschemadata/bridge.xml;h=ece087ea2ef5e3a85fd708ff44286acb15680a64;hb=HEAD 2: http://libvirt.org/formatnetwork.html#examples P.S.: I must ashamedly admit that we don't have any documentation for <i...

...at this is an issue with the interrupt coalescing behavior of the NIC, and its interactions with Xen networking. Is the behavior of e1000e to different MTU settings well-known ? However, when I do the throughput measurement between the hosts (dom0s and not domUs), I do not see any degradation with MTUs >= 1501. Any ideas? GS _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users

...he provider<>asterisk for the DID). The "bad" phone shows roughly twice the number of packets on the phone<>asterisk session as on the other two sessions. The "good" phone shows roughly equal packet counts on each of the 3 sessions. I've used asterisk server MTUs of 1440 and 1500, but it makes no difference. Is this double-packet-count a clue, a problem, or a red herring? The packet counts are shown using "sip show channelstats". - Mike

Hi, The recent (changeset 7700) switch to use the architecture specific skbuff allocation routine breaks with very large MTU sizes. The below patch raises the MAX_SKBUFF_ORDER to 3. Could this be applied to make it the default? Thanks, Phil Signed-Off-by: Philip Auld <pauld@egenera.com> diff -r 136b2d20dc81 linux-2.6-xen-sparse/arch/xen/kernel/skbuff.c ---

...> Maybe we should fail probe if RING_SIZE < 4 until the follow up patchset? I'd keep current behaviour. > I tested the patchset with SNET DPU (drivers/vdpa/solidrun), with packed > and split VQs, with rings down to 4 entries, with and without > VIRTIO_NET_F_MRG_RXBUF, with big MTUs. > > I would appreciate more testing. > Xuan: I wasn't able to test XDP with my setup, maybe you can help with > that? > > [1] https://lore.kernel.org/lkml/20230416074607.292616-1-alvaro.karsz at solid-run.com/ > > Alvaro Karsz (3): > virtio: re-negotiate feature...