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I have a DHCP configured on juniper router srx345 and an external DHCP runing on win machine and configured by telephony ppl.

I'm using an IP tel Astra i740N when I send DHCP request to DHCP server being run localy on srx345 the DHCP replies to back to 10.3.85.12 which is not existing or is not being handed yet.

{root@srx-rad% tcpdump -n -i reth0.2085
15:20:03.584348  In IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:08:5d:1d:67:e9, length 548
15:20:03.849730 Out IP truncated-ip - 247 bytes missing! 10.3.85.1.67 > 10.3.85.12.68: BOOTP/DHCP, Reply, length 269
15:21:22.687841  In IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:08:5d:1d:67:e9, length 548
15:21:22.688052 Out IP truncated-ip - 247 bytes missing! 10.3.85.1.67 > 10.3.85.12.68: BOOTP/DHCP, Reply, length 269
15:21:37.687720  In IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:08:5d:1d:67:e9, length 548
15:21:37.687840 Out IP truncated-ip - 247 bytes missing! 10.3.85.1.67 > 10.3.85.12.68: BOOTP/DHCP, Reply, length 26
}

{primary:node0}
rtomecek@srx-rad> show arp | match 10.3.85.

{primary:node0}
rtomecek@srx-rad> show dhcp server binding    

DHCP POOL
{set routing-instances GLOBAL access address-assignment pool TEST_Wifi_v2084 family inet dhcp-attributes router 10.3.84.1
set routing-instances GLOBAL access address-assignment pool TEST_VOIP_v2085 family inet dhcp-attributes grace-period 86400
set routing-instances GLOBAL access address-assignment pool TEST_VOIP_v2085 family inet dhcp-attributes router 10.3.85.1
set routing-instances GLOBAL access address-assignment pool TEST_VOIP_v2085 family inet dhcp-attributes boot-file 10.0.20.3 }

When I connect other type of a phone, SIP phone in particular, everything works fine.

Also when I have Astra i740N configured to send the DHCP requests to other DHCP server run on win machine which is being configured for IP telephony, everything works.

So is there anything which needs to be further configured on the juniper srx for the IP telephony?

  • Please edit your question to include the device configurations. Otherwise, we're just guessing. – Ron Trunk Aug 6 at 11:52
  • Hello, configuration on my devices is alright, I have just tested another DHCP server which is running on windows machine and has specific config for serving dhcp/bootp requests coming from the IP tel Astra and it works fine. So now I am trying to find what additional information does the DHCP server running on the win machine has configured and are mising on the juniper 345. – black cup Aug 6 at 12:06
  • That's a different question. Please consider editing your question, or asking a different one. – Ron Trunk Aug 6 at 12:13
2

Assuming your Call Server is 10.0.20.3, then I think you've got a mistake in your configuration - you're referencing the TFTP Server IP address using boot-file instead of boot-server. Try the following and see if it fixes your issue:

delete routing-instances GLOBAL access address-assignment pool TEST_VOIP_v2085 family inet dhcp-attributes boot-file 10.0.20.3
set routing-instances GLOBAL access address-assignment pool TEST_VOIP_v2085 family inet dhcp-attributes boot-server 10.0.20.3
  • I have tried the idea with boot-server. It still behaves the same way. But thx for the idea though. – black cup Aug 7 at 8:00

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