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reDDevil

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  1. I checked all my devices in the network. All of them are set automatically to DHCP and have MTU 1500. iMac as well iMac-Dmitry:~ reddevil$ networksetup -getMTU en0 Active MTU: 1500 (Current Setting: 1500) But ifconfig run on iMac shows me one strange interface with MTU 2000 utun0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 2000 inet6 fe80::d71d:9b73:2477:19ef%utun0 prefixlen 64 scopeid 0xe nd6 options=201<PERFORMNUD,DAD> I don't have any VPN, Tunnelblick or Back to my Mac installed 😕 Anyway this interface can't be a reason, I think
  2. Why do you recommend me to find correct MTU for internet connection? There is NO any problem with DOWNLOAD speed to DSM, there is a problem of READ speed from DSM to local divices with mtu 1500 set automatically in DSM
  3. I was revisiting our discussion to give it a second thought and doing some further tests on my system. First of all, it is never enough to show appreciation once again to you guys (flyride, ig-88) for your contribution and help on the matter. Secondly, I think I shall give flyride an extra credit for your critical judgment, whereas critical should for the most part stand for objective and unbiased approach, and where it comes to each of the following: - My conclusions leading to narrowing the problem source down exclusively to DSM are wrong. Or not ultimately right and choiceless to say it another way. At least, by the very idea that one cannot be 100% certain of such unless proven otherwise. Instead, it just seemed to be "obvious" to me. Which isn't the same as "ultimately true". - 2000 MTU is not a standard MTU setting, and shall be potentially avoided by others as a solution indeed. - It can very well be indeed, that there is still an underlying problem with the network setup and behavior. Even if a workaround helps eliminating the issue I'm facing. The biggest issue for me here - for the sake of identifying a true cause of the issue as well as potentially contributing to the community (if, by any means, a flaw is found in the loader build or DSM or driver or whatever) - to find a cause of network issues and I must admit that I feel like I'm in dark, having no clue what to do, as I lack expertise in this. Again I would repeat myself, that I'm willing to devote as much time and effort as can potentially be required to nail this down, providing I (hopefully) get some guidance and suggestions from the community members, who have more expertise in the field (and some time to devote themselves to this). At a same time, I don't need special skills to experiment further, eg with other devices and compare its behavior at least, so this is where I continue to at the moment. I would like to emphasize, that whatever results I'm having and as much as I'm eager to share it here (follows further below) with the community, such shall not be seen as if I'm pushing further my idea of blaming DSM as a source of the issue. However, these findings, albeit indirectly, still can help others as well as give a hint of where the problem really lies. Having said all this, I however think that the same critical and an unbiased approach shall be followed when considering DSM as an alternative potential cause of the problem. Meaning: as well as I might have issues with network, the DSM might have issues, too. One very important note or correction to make here: DSM itself shall be left alone. Its not about it, but rather - about the loader and/or the driver that handles network connection and only IF such is a case. To rephrase: we shall neither exclude my network setup flaw, nor the potential flaw possibility in the loader and/or any such element in this chain, which is responsible for handling the network transport and its parameters and settings. The DSM itself - providing it is not being adjusted during the installation - is taken "as is" from the Synology website, so there indeed could be nothing wrong with it. However, the way how loader and/or DSM handles the hardware it wasn't originally designed for - potentially might cause issues, might it not? As for my findings: - First of all, I've tried to adjust MTU setting back to 1500 in the DSM. Unfortunately, it doesn't work this way. So my previous solution is indeed not a solution, but a workaround of a sort. Probably a valid one, but no more than a workaround, meaning that there still might be a network issue somewhere. - I've taken the effort of installing the FreeNAS 9.10.2 onto my HP ex485. Immediately upon installation that went successfully, I've been receiving "proper" speeds on both read and write without any need to tinker with settings. - The FreeNAS on HP ex485 has an MTU settings of 1500 and it seems to work just fine. I would yet again repeat myself that I'm in no way posting these results to reassure myself and the respectful community members of me being right and to "blame" DSM (or rather, loader) for the issues, but to be fully honest, I think that this at least shall not be disregarded when overviewing the issue on global scale. I hope these finding give us some food for a thought at least, and am wondering what you guys think of it...
  4. All devices are set to dhcp. Excluding just some of them to have the fixed IP address from the router. No more abnormal manual settings
  5. Let's go deeper into this issue. I agree to make as much experiments and tests as need with pleasure if it may be useful for community. I just don't know where to seek
  6. 1500 MTU can not be fixed manually in the settings of DSM unfortunately with unknown reason and I don't have enough experience to dig this issue deeper. Of course not. Sorry if I could offend you personally or community by my words. I just want to say that after my experiments as "blind kitten" I could find some threads through google by the request "dsm slow speed mtu" to see that some people found this way also as a decision of the problem. I have no Idea what may be wrong with a whole infrastructure. I gave you several times the explanations that other NASes including original Synology are working perfect in the same infrastructures without any tuning of MTU on them. So what shall I think as an ordinary user? The problem is at the client or at the server? I made a decision that at the server, and manipulations with MTU on DSM prove that. Sorry if I am wrong. But now it works as it should
  7. I am really sorry for misunderstanding caused because of my bad English. I just wanted to ask if you correctly understood according which adapter (internal or external) I used lspci -k to discover kernel driver used. Ten minutes ago I accidentally found a SIMPLE solution which solved slow reed speed issue to any device in my network (iMac, Windows, SmartTV, etc.) There seems to be a bug with MTU in DSM or a driver. By default the settings are Auto for MTU there but do not work correctly. To fix that it is necessary go to Control Panel / Network / Network Interface Choose LAN 1, then Edit. Tick a box "Set MTU value manually" and choose 1500 MTU value. Press OK. After that you will see that MTU settings are reverted back to Auto. Tick a box "Set MTU value manually" again and choose 2000 MTU value. Press OK. That is all. The MTU will be set manually to 2000 and all issues with low read speed from DSM are gone for any devices in my network. Now DSM works just like "The Fast and the Furious" 😃 It's a pity that finding this solution took a whole week. Hope, my experience will help others in such situation Thank you flyride and IG-88 for a discussion
  8. Are you sure? That was the answer to flyride on my question how to check current driver for internal NIC (not external AX88179) which I am trying to make working to check my guess with low read speed through internal NIC
  9. you are right, I can not see the difference. I just can say that the boot process is abnormal with unknown reason when USB NIC is in a port of NAS. And there is no serial port in ex485 unfortunately Thank you for explanation. The only strange thing that I can switch between adapters during installation process but not when DSM is installed 😕 The vid/pid of my USB NIC are 0B95/1790 and I can see it in a "FULL Hardware list support 6.2.0 synoboot DS3615xs" USB https://xpenology.com/forum/topic/34466-full-hardware-list-support-620-synoboot-ds3615xs-usb/ But what does it mean in a situation when I try to use ds3617 6.3.2-25426? ShalI I try to use 6.2 for ds3615? Or 6.3.2 for ds3617 includes it as well
  10. I repeated a try to run my server with prepared flash drive for clean installation or with installed DSM through internal NIC with external USB NIC connected many times but none of try was successful LEDs on USB NIC are not blinking and DSM doesn't boot. Probably this is an issue of the hardware or BIOS settings which I can not change because hp ex485 is a headless machine and I can not check what's wrong is going there. How can you explain then that I could get USB NIC working after loading DSM to initial screen through internal LAN as hotplug and I even could make a full setup through USB NIC? When DSM was installed successfully in that way and gone for reboot it didn't boot
  11. I tried both variants. Unfortunately DSM does not boot with USB NIC in the port even after successfull installation process. No LEDs, nothing. As soon as I disconnect it from the USB port and connect cable to the internal LAN, the DSM is up and running. But when it is loaded and I am trying to plug-in again the USB NIC nothing happens. No LEDs, no connect to DSM. Tried to use extra.izma 0.11 but it didn't help
  12. Hello! Please explain me how I can use correctly the external USB 3.0 LAN adapter with AX88179 chip to make a clean install of ds3617 DSM 6.3.2-25426 (or below) to let it work with that external adapter HP Ex485 MediaSmart server (headless) CPU: Intel Pentium Processor E5200 2M Cache, 2.50 GHz, 800 MHz FSB RAM: 2Gb DDR2 SDRAM 800 Mhz LAN adapter: Realtek 10/100/1000 (Gigabit) RJ45 Ethernet. With DSM 6.3.2 already installed through integrated LAN adapter the external USB doesn't work as "Plug & play", nor with DSM booted nor after reboot. I can not see it as a LAN2 in DSM as well as there is no new client in DHCP list of the router with MAC address of the adapter. If I reboot DSM with USB LAN adapter plugged, the DSM doesn't start anymore unfortunately. After some tries I could make somehow working my USB NIC only in such way: Prepared USB with 1.03b loader with MAC and serial number generated as usually. LAN cable is in internal LAN adapter. When loader is successfully booted, Synology Assistant detected DiskStation (with generated MAC from grub.cfg) and initial page of web assistant is available through browser, I plug my USB NIC into USB port of my server. After that I can see that USB NIC in DHCP list of the router and I can get an access to a web assistant through new IP address provided according to MAC address of USB NIC. But in this way the Synology assistant finds DiskStation with the original MAC address of USB NIC, not which was used in grub.cfg So the question is: can I try to make an installation of DMS with this way discovered? Or after reboot DSM will not start because of some reasons which did not let start DSM when it was already installed? Or I have to change MAC address in grub.cfg before or after installation of DSM to the original MAC address of USB NIC? Or what is the right way? Thank you in advance
  13. 0000:02:00.0 Class 0200: Device 10ec:8168 (rev 02) Subsystem: Device 10ec:8168 Kernel driver in use: r8168 I can see these records there as soon as I connect an external USB LAN adapter. But I can not see it as a LAN2 in DSM as well as there is no new client in DHCP list of the router with MAC address of the adapter . If I reboot DSM with USB LAN adapter plugged, the DSM doesn't start [176300.759029] usb 2-3: new high-speed USB device number 4 using ehci-pci [176301.219237] ax88179_178a 2-3:1.0 eth1: register 'ax88179_178a' at usb-0000:00:1d.7-3, ASIX AX88179 USB 3.0 Gigibit Ethernet, ##:##:##:##:##:4d
  14. Well. I have no idea how it is possible but I could reach normal read speed ONLY from Windows (same rj45 outlet and cable as iMac is connected), only through CIFS, and only directly through IP address of DSM. Ie: If I am connecting to DSM as \\192.168.1.30\video the speeds in Lan Speed test and in File Explorer are: 87/98MBps. As soon as I am connected as \\HPEX485\video (ie manually or through Network icon in File Explorer) the speeds are 78/1.82MBps. At the same time, If I am connected to DSM from iMac through smb://192.168.1.30/video and trying to do LAN Speed test or download a file from /video shared folder the speed is dramatically low about 150KBps Also I made a check of downloading speed via browser through File Station: on iMac it is about 6.4MB/s (according to Resource Monitor), on Windows it is about 40MB/s So I do not understand anything what is going wrong there
  15. But again... A friend of mine (who should join this discussion later) has same issue with absolutely different network setup. He also has lost packets from DSM to his iMac but in addition he has the original Synology where he also has lost packets to iMac but at the same time he has not any complaints for write/read speeds in his network with original Synology
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