HP LaserJet 400 MFP M425dn: bug in MTU path discovery, printer reboots via web interface

Firmware Datecode: 20121205
1. We can not access this MFU over VPN link. Otherer devices are accessed successfully.
As far as I understand there is an error in MTU Path Discovery.
tcpdump logs are attached.
Is there a way to change MTU of this device?
2. This MFU a reboots when I open page "Settings" of "Networking" submenu (/hp/device/set_config_networkSettings.html?tab=Networking&menu=NetSettings) if option "System" -> "System Setup" -> "Language" is "Russian". But this looks like a very good feature since I've have not found the way to reboot this printer remotely.
Here I was tring to access web interface over VPN (IPSec), 192.168.4.135 is IP of my comp, 192.168.160.200 - is IP of MFU, 192.168.160.254 is a gateway:
$ tcpdump -n -r printer-1.pcap
reading from file printer-1.pcap, link-type EN10MB (Ethernet)
17:20:29.337867 IP 192.168.4.135.54147 > 192.168.160.200.80: Flags [S], seq 2356029847, win 8192, options [mss 1460,nop,nop,sackOK], length 0
17:20:29.338026 IP 192.168.160.200.80 > 192.168.4.135.54147: Flags [S.], seq 614551948, ack 2356029848, win 8760, options [mss 1460,nop,nop,sackOK], length 0
17:20:29.344909 IP 192.168.4.135.54147 > 192.168.160.200.80: Flags [.], ack 1, win 64240, length 0
17:20:29.348488 IP 192.168.4.135.54147 > 192.168.160.200.80: Flags [P.], seq 1:304, ack 1, win 64240, length 303
17:20:29.348564 IP 192.168.160.200.80 > 192.168.4.135.54147: Flags [.], ack 304, win 8457, length 0
17:20:29.378872 IP 192.168.160.200.80 > 192.168.4.135.54147: Flags [P.], seq 1:513, ack 304, win 8457, length 512
17:20:29.379063 IP 192.168.160.200.80 > 192.168.4.135.54147: Flags [.], seq 513:1973, ack 304, win 8457, length 1460
17:20:29.379100 IP 192.168.160.254 > 192.168.160.200: ICMP 192.168.4.135 unreachable - need to frag (mtu 1280), length 48
17:20:29.379103 IP 192.168.160.200.80 > 192.168.4.135.54147: Flags [.], seq 1973:3433, ack 304, win 8457, length 1460
17:20:29.379135 IP 192.168.160.254 > 192.168.160.200: ICMP 192.168.4.135 unreachable - need to frag (mtu 1280), length 48
17:20:29.379251 IP 192.168.160.200.80 > 192.168.4.135.54147: Flags [.], seq 1:1461, ack 304, win 8457, length 1460
17:20:29.379272 IP 192.168.160.254 > 192.168.160.200: ICMP 192.168.4.135 unreachable - need to frag (mtu 1280), length 48
17:20:29.379274 IP 192.168.160.200.80 > 192.168.4.135.54147: Flags [.], seq 1461:2921, ack 304, win 8457, length 1460
17:20:29.379304 IP 192.168.160.254 > 192.168.160.200: ICMP 192.168.4.135 unreachable - need to frag (mtu 1280), length 48
17:20:29.379306 IP 192.168.160.200.80 > 192.168.4.135.54147: Flags [.], seq 2921:4381, ack 304, win 8457, length 1460
17:20:29.379335 IP 192.168.160.254 > 192.168.160.200: ICMP 192.168.4.135 unreachable - need to frag (mtu 1280), length 48
17:20:29.379338 IP 192.168.160.200.80 > 192.168.4.135.54147: Flags [.], seq 1:1461, ack 304, win 8457, length 1460
This is more detailed view on some packets.
$ tcpdump -nv -r printer-1.pcap
17:20:29.379063 IP (tos 0x0, ttl 64, id 1, offset 0, flags [DF], proto TCP (6), length 1500)
192.168.160.200.80 > 192.168.4.135.54147: Flags [.], cksum 0x7233 (correct), seq 513:1973, ack 304, win 8457, length 1460
17:20:29.379100 IP (tos 0x0, ttl 64, id 62678, offset 0, flags [DF], proto ICMP (1), length 68)
192.168.160.254 > 192.168.160.200: ICMP 192.168.4.135 unreachable - need to frag (mtu 1280), length 48
IP (tos 0x0, ttl 64, id 1, offset 0, flags [DF], proto TCP (6), length 1500)
192.168.160.200.80 > 192.168.4.135.54147: Flags [.], seq 513:1973, ack 304, win 8457, length 1460
17:20:29.379103 IP (tos 0x0, ttl 64, id 1, offset 0, flags [DF], proto TCP (6), length 1500)
192.168.160.200.80 > 192.168.4.135.54147: Flags [.], cksum 0x5edf (correct), seq 1973:3433, ack 304, win 8457, length 1460
17:20:29.379135 IP (tos 0x0, ttl 64, id 62679, offset 0, flags [DF], proto ICMP (1), length 68)
192.168.160.254 > 192.168.160.200: ICMP 192.168.4.135 unreachable - need to frag (mtu 1280), length 48
IP (tos 0x0, ttl 64, id 1, offset 0, flags [DF], proto TCP (6), length 1500)
192.168.160.200.80 > 192.168.4.135.54147: Flags [.], seq 1973:3433, ack 304, win 8457, length 1460
17:20:29.379251 IP (tos 0x0, ttl 64, id 1, offset 0, flags [DF], proto TCP (6), length 1500)
192.168.160.200.80 > 192.168.4.135.54147: Flags [.], cksum 0x0c1c (correct), seq 1:1461, ack 304, win 8457,
P.S. This thread has been moved from LaserJets to Multifunction and All-in-One - HP Forums Moderator

John Getzke wrote:
Its hard to understand what you are trying to do or ask here. We have some offices connected via IPSEC tunnels. IPSEC interface's MTU is 1280 bytes (not 1500 bytes as Ethernet). All other devices successfully work over this VPN link. HP m2727 works. HP m425dn does not work. As a network administrator I've traced source of problem on all possible points and found that HP m425dn has a bug in the "Path MTU Path discovery" routine. The logs I attached shows that any packet of the TCP stream that the printer (160.200) sends to host (4.135) has "Don't fragment" flag set. According to IP standard the router HAVE TO discard the packet with DF flag set and size bigger then MTU since it can not pass a packet further without fragmentation - IPSEC MTU is 1280 bytes only while HP sends 1500 bytes. The router informs the printer about this problem with ICMP message Type: 3 (Destination unreachable) with Code: 4 (Fragmentation needed) suggesting MTU of next hop: 1280. The router does not communicate with the printer itself, it just informs the printer about network problem. According to IP standard the printer HAVE TO resend this data with the size of packet decreased according to suggested size. This is expected behavior of the Path MTU discovery routine. But the printer sends the packet again with the same size and DF flag set. The router again discards the packet and informs printer... This cycle repeats again and again until connection is closed due to timeout. Therefore "Path MTU discovery" routine is broken at this device. It would not be a serious problem, but the printer resends packets at rate over 28000 pps (about 40 MBytes per seconds) and its CPU is so heavily loaded that it even does not respond to touches on its touchscreen. So an innocent attempt to print document on terminal server located at another office leads to inaccessibility of the printer.
The network dump can be downloaded in PCAP format from here.

Similar Messages

Problems with HP LaserJet 400 MFP M425dn

Firmware Datecode: 20121205
We can not access this MFU over VPN link. Otherer devices are accessed successfully.
As far as I understand there is an error in MTU Path Discovery.
tcpdump logs are attached.
Is there a way to change MTU of this device?
BTW, this MVU a bit randomly reboots when I open page "Settings" of "Networking" submenu (/hp/device/set_config_networkSettings.html?tab=Networking&menu=NetSettings) if option "System" -> "System Setup" -> "Language" is "Russian". But this is a very good feature since I've have not found the way to reboot this printer remotely.
Here I was tring to access web interface over VPN (IPSec), 192.168.4.135 is IP of my comp, 192.168.160.200 - is IP of MFU, 192.168.160.254 is a gateway:
$ tcpdump -n -r printer-1.pcap
reading from file printer-1.pcap, link-type EN10MB (Ethernet)
17:20:29.337867 IP 192.168.4.135.54147 > 192.168.160.200.80: Flags [S], seq 2356029847, win 8192, options [mss 1460,nop,nop,sackOK], length 0
17:20:29.338026 IP 192.168.160.200.80 > 192.168.4.135.54147: Flags [S.], seq 614551948, ack 2356029848, win 8760, options [mss 1460,nop,nop,sackOK], length 0
17:20:29.344909 IP 192.168.4.135.54147 > 192.168.160.200.80: Flags [.], ack 1, win 64240, length 0
17:20:29.348488 IP 192.168.4.135.54147 > 192.168.160.200.80: Flags [P.], seq 1:304, ack 1, win 64240, length 303
17:20:29.348564 IP 192.168.160.200.80 > 192.168.4.135.54147: Flags [.], ack 304, win 8457, length 0
17:20:29.378872 IP 192.168.160.200.80 > 192.168.4.135.54147: Flags [P.], seq 1:513, ack 304, win 8457, length 512
17:20:29.379063 IP 192.168.160.200.80 > 192.168.4.135.54147: Flags [.], seq 513:1973, ack 304, win 8457, length 1460
17:20:29.379100 IP 192.168.160.254 > 192.168.160.200: ICMP 192.168.4.135 unreachable - need to frag (mtu 1280), length 48
17:20:29.379103 IP 192.168.160.200.80 > 192.168.4.135.54147: Flags [.], seq 1973:3433, ack 304, win 8457, length 1460
17:20:29.379135 IP 192.168.160.254 > 192.168.160.200: ICMP 192.168.4.135 unreachable - need to frag (mtu 1280), length 48
17:20:29.379251 IP 192.168.160.200.80 > 192.168.4.135.54147: Flags [.], seq 1:1461, ack 304, win 8457, length 1460
17:20:29.379272 IP 192.168.160.254 > 192.168.160.200: ICMP 192.168.4.135 unreachable - need to frag (mtu 1280), length 48
17:20:29.379274 IP 192.168.160.200.80 > 192.168.4.135.54147: Flags [.], seq 1461:2921, ack 304, win 8457, length 1460
17:20:29.379304 IP 192.168.160.254 > 192.168.160.200: ICMP 192.168.4.135 unreachable - need to frag (mtu 1280), length 48
17:20:29.379306 IP 192.168.160.200.80 > 192.168.4.135.54147: Flags [.], seq 2921:4381, ack 304, win 8457, length 1460
17:20:29.379335 IP 192.168.160.254 > 192.168.160.200: ICMP 192.168.4.135 unreachable - need to frag (mtu 1280), length 48
17:20:29.379338 IP 192.168.160.200.80 > 192.168.4.135.54147: Flags [.], seq 1:1461, ack 304, win 8457, length 1460
This is more detailed view on some packets.
$ tcpdump -nv -r printer-1.pcap
17:20:29.379063 IP (tos 0x0, ttl 64, id 1, offset 0, flags [DF], proto TCP (6), length 1500)
192.168.160.200.80 > 192.168.4.135.54147: Flags [.], cksum 0x7233 (correct), seq 513:1973, ack 304, win 8457, length 1460
17:20:29.379100 IP (tos 0x0, ttl 64, id 62678, offset 0, flags [DF], proto ICMP (1), length 68)
192.168.160.254 > 192.168.160.200: ICMP 192.168.4.135 unreachable - need to frag (mtu 1280), length 48
IP (tos 0x0, ttl 64, id 1, offset 0, flags [DF], proto TCP (6), length 1500)
192.168.160.200.80 > 192.168.4.135.54147: Flags [.], seq 513:1973, ack 304, win 8457, length 1460
17:20:29.379103 IP (tos 0x0, ttl 64, id 1, offset 0, flags [DF], proto TCP (6), length 1500)
192.168.160.200.80 > 192.168.4.135.54147: Flags [.], cksum 0x5edf (correct), seq 1973:3433, ack 304, win 8457, length 1460
17:20:29.379135 IP (tos 0x0, ttl 64, id 62679, offset 0, flags [DF], proto ICMP (1), length 68)
192.168.160.254 > 192.168.160.200: ICMP 192.168.4.135 unreachable - need to frag (mtu 1280), length 48
IP (tos 0x0, ttl 64, id 1, offset 0, flags [DF], proto TCP (6), length 1500)
192.168.160.200.80 > 192.168.4.135.54147: Flags [.], seq 1973:3433, ack 304, win 8457, length 1460
17:20:29.379251 IP (tos 0x0, ttl 64, id 1, offset 0, flags [DF], proto TCP (6), length 1500)
192.168.160.200.80 > 192.168.4.135.54147: Flags [.], cksum 0x0c1c (correct), seq 1:1461, ack 304, win 8457,

Sandy0331,
I am sorry you are having this fax issue.
I think the best option would be for you to print out the fax log. I believe it will reprint the last 50 inbound and outbound faxes.
Check the fax activity log for errors.
a.Touch the Fax button, and then touch the Fax Menu button.
b.Open the Fax Reports menu.
c.Open the Fax Activity Log menu.
d.Select the Print Log Now option.
●If a phone is connected to the product, make sure that the phone is hung up.
●Disconnect all other lines between the fax and the product.
●Connect the product directly into the wall telephone jack and resend the fax.
Source: http://bizsupport1.austin.hp.com/bc/docs/support/SupportManual/c02853746/c02853746.pdf
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HP LaserJet 400 MFP M425dn does not print 1/4" of the page when using the feeder

Hello,
When using the feeder to make a copy I lose about 1/4" of my copy along one side.
We copy a lot of full page sheets with little or no margins.
Any suggestions on how to correct this?
Thank you

Most (if not all) commonly available laser printers have 'unprintable margins' on each edge.
On most LaserJet printers, these margins are about 4 mm (0.167"), although on some devices I believe that smaller unprintable area margins (of about 2 mm) can be selected when printing (although possibly not when copying).
When printing with PCL5 drivers, there is also the minimum logical page margin to be taken into account - this is about 6 mm (0.24") by default, although the printing options mentioned above (on some models) can reduce this slightly.
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Up!

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Sandy0331,
I am sorry you are having this fax issue.
I think the best option would be for you to print out the fax log. I believe it will reprint the last 50 inbound and outbound faxes.
Check the fax activity log for errors.
a.Touch the Fax button, and then touch the Fax Menu button.
b.Open the Fax Reports menu.
c.Open the Fax Activity Log menu.
d.Select the Print Log Now option.
●If a phone is connected to the product, make sure that the phone is hung up.
●Disconnect all other lines between the fax and the product.
●Connect the product directly into the wall telephone jack and resend the fax.
Source: http://bizsupport1.austin.hp.com/bc/docs/support/SupportManual/c02853746/c02853746.pdf
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IPv4 Gateway Issue? - HP LaserJet 400 M401dn / 400 MFP M425dn

Hello,
I work in healthcare and in our environment we have mostly HP LaserJet printers. Within the last 6 - 12 months we have started using some HP LaserJet 400 M401dn and HP LaserJet 400 MFP M425dn printers. They all have been updated with the latest firmware (20 printers) and connect to the network via ethernet using IPv4. We are having an issue when trying to print to them from a specific application. It's only happening on these particular models. All other HP LaserJet printers DO NOT have this problem (HP LaserJet 2015dn, 2055dn, P4015dn, 600 M602dn). The application is a telnet client using SSL that connects to a server. This server is on a different subnet (128.1.x.x) than the printers (10.92.x.x) that the clients print to.
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Sleep Mode is disabled on all of these printers. IPv4 settings are all correct and have been verified by various IT staff.
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Regards.

To start off, the issue you are having may be caused by the softare you are using or the HP software. I am gonig ot to do some investigating to find out. I will want to to make sure that the softare is the most current version, follow the link below and reinstall if necessary (do not rely upon the CD-ROM):
http://h20000.www2.hp.com/bizsupport/TechSupport/DriverDownload.jsp?prodNameId=5096244&lang=en&cc=us...
Then if it is the same or you are still having issues I would recommend trying to use the PCL6 drivers for this. They offere a broader support to some of the more code specific programs :
http://h20000.www2.hp.com/bizsupport/TechSupport/ProductList.jsp?locale=en_US&taskId=135&prodTypeId=...
Run through that and let me know how it goes, I'll get right back in touch with you!
-Spencer
PS :: Can you print to this printer from other programs? Have a wonderful day!

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PLEASE help

Hello try to send the first fax then push home button and then send second fax

HP LaserJet Pro 400 MFP M425dn won't print text at 72 point size or larger

My workplace recently purchased an HP LaserJet Pro 400 MFP M425dn all-in-one printer. It works excellently with the exception of the fact that it won't print text that's 72 points or larger in size. I've tried numerous fonts that're pre-installed with Windows, and all of them print properly at point size 71.5 or smaller; anything else simply doesn't show up in prints. The content that's sized at 72 points or higher *does* affect the flow of other printed content on the page, however. It's like the 72-point or larger text is occupying space, but it's completely invisible on the printed page. I've tested this using Microsoft Word 2002 on three separate computers, two of which have Windows 7 installed and one of which has Windows Vista installed. The problem is identical on all three computers. The printer is connected via ethernet cable to our wired network. I've installed the included printer software, and I don't believe that there are any updates to it that weren't installed up to this point. Any thoughts on how to resolve this issue?

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Hey @AlchemistYA ,
I suspect your question would be better answered in the HP Enterprise Business Community, as your HP Printer is a commercial model.
My technical expertise is with consumer products and software, I am sure the commercial folks would be happy to help if you re-post your question for them to answer. The HP Enterprise Business Community is an HP Forum designed for the Commercial and Enterprise customers to help one another. I am sure you will find some HP folks there to help too.
Click here to view the Printing and Digital Imaging. When the page opens you will see the option to 'Log in' or 'Register Now' on the right. The commercial forums are separate from the consumer boards, thus you will need to register if you don't already have a commercial account.
You may find the HP LaserJet Pro 400 MFP M425 page helpful while you wait for somebody in the commercial Forum to respond to your inquiry.
Best of luck.
I worked for HP.

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Hi there,
The issue I am having with my HP Laserjet Pro 400 MFP M425dn is that when Iam scanning some pages scan in parts black and sometimes the whole page black??? (see botttom of page where the scan preview shows)

Hi chicalatina,
Welcome to the HP Forums.
To get your issue more exposure I would suggest posting it in the commercial forums since this is a commercial product. You can do this at Commercial Forums.
Thanks for your time.
Cheers,
Click the “Kudos Thumbs Up" at the bottom of this post to say “Thanks” for helping!
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
W a t e r b o y 71
I work on behalf of HP

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@aswit
‎Thank you for using HP Support Forum. I have brought your issue to the appropriate team within HP. They will likely request information from you in order to look up your case details or product serial number. Please look for a private message from an identified HP contact. Additionally, keep in mind not to publicly post ( serial numbers and case details).
If you are unfamiliar with the Forum's private messaging please click here to learn more.
Thank you,
Omar
I Work for HP

Hp laserjet 400 mfp can't scan, i lost the installation cd

Hello,
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Hi, thank you for your answer. I tried with the full software you gave me in your link, but it was no good, because my printer is a Laserjet 4100 MFP, and the software was asking for an usb device, wich my printer is not...
I don't need the driver for the printer, i have that driver, but that driver sees the MFP like a simple printer, without scanner, so, the scanner remains usefull. I need the full software or the CD.
I don't receive an error, i just need the full software for Laserjet 4100 MFP. I didn't find it on HP's website, unfortunately and i don't have the installation CD anymore, cause i lost it....
Thank you.

HP LaserJet 400 MFP M425dn: bug in MTU path discovery, printer reboots via web interface

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