Jumbo-Frames on GS1200-5/8?

knebb · July 17

Hi,

my GS1200-5 has the latest firmware installed. According to marketing speech it can deal with Jumbo Frame.

Unfortunately I do not see any options to enable it. And it looks like it does not offer Jumbo frames.

My QNAP NAS is connected to a QNAP switch (both Jumbo Frames enabled) and the GS1200-5 is connected to the QNAP switch.

I can do large pings from my NAS to the QNAP switch. But pinging the ZyXEL switch it fails. Even tried to ping a Jumbo-Frame enabled device connected to the GS1200 but fails, too.

[~] # ping -s 8972 192.168.8.241     
PING 192.168.9.241 (192.168.8.241): 8972 data bytes
8980 bytes from 192.168.8.241: seq=0 ttl=64 time=9.217 ms
8980 bytes from 192.168.8.241: seq=1 ttl=64 time=3.616 ms
8980 bytes from 192.168.8.241: seq=2 ttl=64 time=6.514 ms
8980 bytes from 192.168.8.241: seq=3 ttl=64 time=6.227 ms
^C
--- 192.168.8.241 ping statistics ---
4 packets transmitted, 4 packets received, 0% packet loss
round-trip min/avg/max = 3.616/6.393/9.217 ms
[~] # ping -s 8972 192.168.8.242
PING 192.168.8.242 (192.168.8.242): 8972 data bytes
^C
--- 192.168.8.242 ping statistics ---
5 packets transmitted, 0 packets received, 100% packet loss
[~] # ping -s 8972 jumbo.example.com
PING jumbo.example.com (192.168.8.154): 8972 data bytes
^C
--- jumbo.example.com ping statistics ---
5 packets transmitted, 0 packets received, 100% packet loss

.241 ist the QNAP switch; .242 the GS1200-5 and .154 the device with Jumbo Frames enabled.

So either I did not find the option how to enable Jumbo Frames on the GS1200-5 or it does not forward them at all.

Anyone having a clue?

/KNEBB

Zyxel_Lynn · July 18

Hi @knebb

The GS1200-5 supports Jumbo Frame by default, so manual configuration is not required. I also reproduced a similar scenario by connecting PC A (with jumbo packets enabled) to the GS1200-8 (which supports Jumbo Frames by default). The results indicates that PC A can successfully transmit jumbo frame packets to the GS1200-8, and the ping test passes. I also connected PC B (with jumbo packets enabled) to the GS1200-8, and the ping test from PC A to PC B was successful as well. Since I don't currently have access to a QNAP NAS for testing, it would be greatly appreciated if you could help identify the issue by following these steps:

Connect the QNAP NAS directly to the GS1200-8
Connect another device with jumbo frame enabled to the GS1200-8
Perform a ping test between the QNAP NAS and the jumbo frame-enabled device

If the ping test continues to fail, could you please provide the screenshot of your Wireshark ping test result? This will help us analyze what might be causing the problem during the ping test.

We would be very grateful for your assistance with this troubleshooting process.

Best regards,

Lynn

Zyxel_Lynn · July 18

Hi @knebb

The GS1200-5 supports Jumbo Frame by default, so manual configuration is not required. I also reproduced a similar scenario by connecting PC A (with jumbo packets enabled) to the GS1200-8 (which supports Jumbo Frames by default). The results indicates that PC A can successfully transmit jumbo frame packets to the GS1200-8, and the ping test passes. I also connected PC B (with jumbo packets enabled) to the GS1200-8, and the ping test from PC A to PC B was successful as well. Since I don't currently have access to a QNAP NAS for testing, it would be greatly appreciated if you could help identify the issue by following these steps:

Connect the QNAP NAS directly to the GS1200-8
Connect another device with jumbo frame enabled to the GS1200-8
Perform a ping test between the QNAP NAS and the jumbo frame-enabled device

If the ping test continues to fail, could you please provide the screenshot of your Wireshark ping test result? This will help us analyze what might be causing the problem during the ping test.

We would be very grateful for your assistance with this troubleshooting process.

Best regards,

Lynn

knebb · July 18

Hi,

well…. I figured something out. I set my MacBookPro (with Thunderbold/Ethernet adapter) to:

Using a packet size of >=8165 —> leads to errors.

Using a packet size of 8164 —> works fine!

So I guess it is the usual issue between different companies reading different things in standards… I had the above ping issue no matter which switch I had in-between.

Setting my Mac now to 8192 (instead of 9000) and it works

/KNEBB

Jumbo-Frames on GS1200-5/8?

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