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Static IP address not pingable on Juniper network

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11 years 3 months ago #38249 by Losh
Hi all

I recently encountered an issue when configuring a LAN.
I am using a juniper J2320 router and Juniper EX3200 switch.

The J-series router acts as my DHCP server and the EX-series is my LAN access switch.

Hosts on the LAN are acquiring an IP address dynamically from the DHCP server without any issue and are pingable and reachable.

However, if i assign a static IP within the same LAN range to a host on the LAN, i can't ping it and the host is not reachable.

Has anyone encountered this? Any solution/recommendations are welcome.

~ Networking :- Just when u think its starting to make sense......... ~
____________________________________________
CCNA, CCNP, CCNA Security, JNCIA, APDS, CISA
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11 years 3 months ago #38250 by Nevins
I'm not a juniper expert but is there a chance that DHCP already assigned that IP address somewhere?


What is your address range and what is your DHCP range? Does your static address fall into the DHCP range?

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11 years 3 months ago - 11 years 3 months ago #38251 by Nevins
Last edit: 11 years 3 months ago by Nevins.
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11 years 3 months ago - 11 years 3 months ago #38252 by Losh
Hi Nevins
Thanks for your reply.
The post really helped.

DHCP has not assigned that IP address on another device. I used the command below to check

show dhcp server binding
5 clients, (0 bound, 0 selecting, 0 renewing, 5 rebinding)

IP address Hardware address Type Lease expires at
10.20.32.31 90:00:00:01:00:01 active 2009-01-17 11:38:47 PST
10.20.32.33 90:00:00:02:00:01 active 2009-01-17 11:38:41 PST
10.20.32.34 90:00:00:03:00:01 active 2009-01-17 11:38:01 PST
10.20.32.35 90:00:00:04:00:01 active 2009-01-17 11:38:07 PST
10.20.32.46 90:00:00:05:00:01 active 2009-01-17 11:38:47 PST

And YES the static address falls into the DHCP range.
I dont know if its the firewall services within the JUNOS that is blocking this.

As a work-around, i forced the host to acquire the IP i want dynamically by using the commands below.
However, i am still looking at a final solution. Why can't i use static IPs?

show configuration system services dhcp
>> > static-binding 00:40:01:27:e2:87
>> > fixed-address {
>> > 10.20.32.36;
>> > }
>> > router {
>> > 10.20.32.254;

~ Networking :- Just when u think its starting to make sense......... ~
____________________________________________
CCNA, CCNP, CCNA Security, JNCIA, APDS, CISA
Last edit: 11 years 3 months ago by Losh. Reason: colour is too dull
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11 years 3 months ago #38253 by Nevins
Try reducing the size of your DHCP pool and then assign an address that isn't a pool.


kb.juniper.net/InfoCenter/index?page=content&id=KB15754


Also try : show system services dhcp conflict

www.juniper.net/techpubs/en_US/junos10.4...s-dhcp-conflict.html

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