Dhcp option 12 not being sent? : Helpdesk platform

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Dean Hamstead

started a topic 8 months ago

I have both 710 and 720 handsets running V8.9.3.80

For some reason they are no longer sending dhcp option 12 (hostname)

Here is an example from tcpdump

23:21:23.788323 IP (tos 0x0, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 361)
    0.0.0.0.bootpc > 255.255.255.255.bootps: [udp sum ok] BOOTP/DHCP, Request from 00:04:13:76:27:19 (oui Unknown), length 333, xid 0x3829b40d, Flags [none] (0x0000)
          Client-Ethernet-Address 00:04:13:76:27:19 (oui Unknown)
          Vendor-rfc1048 Extensions
            Magic Cookie 0x63825363
            DHCP-Message Option 53, length 1: Discover
            Parameter-Request Option 55, length 14:
              Subnet-Mask, Default-Gateway, Time-Server, Domain-Name-Server
              Hostname, Domain-Name, NTP, Vendor-Option
              Lease-Time, FQDN, Option 120, Option 125

              Option 132, Option 133
            Vendor-Class Option 60, length 7: "snom710"
            FQDN Option 81, length 14: [S] "snom710-553"
            T125 Option 125, length 30: 0,3561,6401,1584,12336,13361,13058,1591,13874,14129,14595,1907,28271,27959,12592
            Agent-Information Option 82, length 14:
              Circuit-ID SubOption 1, length 4: ^A,^@^N
              Remote-ID SubOption 2, length 6: dfM-3M-#M-iM-^@
            END Option 255, length

I cannot find any config option that seems to control it. The v7 series firmware had no such problems on nearly identical config

Best Answer

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Catalina Oancea said 8 months ago

It seems that the option 81 "overwrites" option 12. I could reproduce in the lab that if you activate option 81, option 12 will get deactivated.

Do you need option 81? if not, please remove it from the setting dhcp_options_on_ip_aquire .

Let me know if this solves the problem.

Thanks

Catalina

C

Catalina Oancea

said 8 months ago

Hi Dean,

Sorry for the delay. There is a setting that my help here: http://wiki.snom.com/Settings/dhcp_options_on_ip_aquire . Option 12 is on by default.

I just tested with 710 and version 8.9.3.80, after factory reset (to make sure all configuration is default) it sent option 12 in the DHCP discovery:

Bootstrap Protocol (Discover)
Message type: Boot Request (1)
Hardware type: Ethernet (0x01)
Hardware address length: 6
Hops: 0
Transaction ID: 0xad03d087
Seconds elapsed: 0
Bootp flags: 0x0000 (Unicast)
Client IP address: 0.0.0.0
Your (client) IP address: 0.0.0.0
Next server IP address: 0.0.0.0
Relay agent IP address: 0.0.0.0
Client MAC address: SnomTech_74:2a:21 (00:04:13:74:2a:21)
Client hardware address padding: 00000000000000000000
Server host name not given
Boot file name not given
Magic cookie: DHCP
Option: (53) DHCP Message Type (Discover)
Option: (55) Parameter Request List
Option: (60) Vendor class identifier
Option: (12) Host Name
Length: 14
Host Name: snom710-742A21
Option: (125) V-I Vendor-specific Information
Option: (255) End

I would therefore recommend that you check setting http://wiki.snom.com/Settings/dhcp_options_on_ip_aquire or factory reset the phone and try again.

I hope this helps.

Thanks

Catalina

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Dean Hamstead

said 8 months ago

This is my current setting:

<dhcp_options_on_ip_aquire perm="">1 3 4 6 12 15 42 43 51 81 120 125 132 133</dhcp_options_on_ip_aquire>

C

Catalina Oancea

said 8 months ago

Hi Dean,

Can you please do a factory reset and see if it solved the problem? If it still doesn't work please get a PCAP Trace from the DHCP request and I will open a ticket for you to send it privately for me to check.

Thanks

Catalina

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Dean Hamstead

said 8 months ago

after factory reset the option 12 is present. however once the config file i loaded it is no longer sent.

here is the config file saved from the phone
(attached)

xml

settings.xml

(77.9 KB)

C

Catalina Oancea

said 8 months ago

Answer

It seems that the option 81 "overwrites" option 12. I could reproduce in the lab that if you activate option 81, option 12 will get deactivated.

Do you need option 81? if not, please remove it from the setting dhcp_options_on_ip_aquire .

Let me know if this solves the problem.

Thanks

Catalina

D

Dean Hamstead

said 8 months ago

thats fixed it, thanks