I'm setting up DHCP on my new Sophos UTM installation and am looking for some advice before I end up making a mess of things! [LIST=1] Is it safe to assign static AND dynamic IP addresses from the same pool/DHCP definition? When assigning a static IP address I would like an entry to be added automatically to the DNS server. I've done some reading up on this but found it confusing; I think what I read may have applied to earlier versions which look like they may have done it differently. I've been setting up multiple DHCP definitions to allocate from a different range to different types of device (eg PCs vs mobile phones). Now that I've gone down this track I'm not convinced it's workable as the only way Sophos would know which pool to assign from is if it knows the device's MAC address - in which case I would need to have everything assigned statically. I've attached a screenshot to show where I'm setting up the static assignments - not sure if I'm doing it correctly in the right place so would love some advice. [/LIST] Thanks in advance for any help.

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DHCP and static mappings

I'm setting up DHCP on my new Sophos UTM installation and am looking for some advice before I end up making a mess of things!

[LIST=1]

Is it safe to assign static AND dynamic IP addresses from the same pool/DHCP definition?
When assigning a static IP address I would like an entry to be added automatically to the DNS server. I've done some reading up on this but found it confusing; I think what I read may have applied to earlier versions which look like they may have done it differently.
I've been setting up multiple DHCP definitions to allocate from a different range to different types of device (eg PCs vs mobile phones). Now that I've gone down this track I'm not convinced it's workable as the only way Sophos would know which pool to assign from is if it knows the device's MAC address - in which case I would need to have everything assigned statically. I've attached a screenshot to show where I'm setting up the static assignments - not sure if I'm doing it correctly in the right place so would love some advice.

[/LIST]

Thanks in advance for any help.

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0 FrankBarmentlo over 10 years ago

Don't know exactly, but I can test some stuff later today, I am currently not at home(where my UTM is), I bookmarked this thread and will get back later today.
Although, in normal DNS-cases, the hostname is known ,even with dynamic leases, and it just works..
do you have any dynamic device that does not have a DNS-entry in the UTM yet?
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0 philled over 10 years ago in reply to FrankBarmentlo

do you have any dynamic device that does not have a DNS-entry in the UTM yet?

Well, I thought I did, but when I put some examples together to reply to you I think I may have got some more info on the problem.

In my original screenshot attachment there was a server called "ash" with IP 192.168.0.214. So I thought I'd run nslookup on my PC to show how it's not in the DNS and I got these results:

[FONT="Courier New"]C:\Users\Phill>nslookup ash
Server:  UnKnown
Address:  192.168.0.254

*** UnKnown can't find ash: Non-existent domain

C:\Users\Phill>nslookup ash.edwards.home
Server:  UnKnown
Address:  192.168.0.254

*** UnKnown can't find ash.edwards.home: Non-existent domain

C:\Users\Phill>nslookup 192.168.0.214
Server:  UnKnown
Address:  192.168.0.254

Name:    ash
Address:  192.168.0.214[/FONT]

As the last command shows, a reverse DNS lookup is working. The message in the first 2 examples says "[FONT="Courier New"]Non-existent domain[/FONT]", so perhaps the problem is that I haven't defined "[FONT="Courier New"]edwards.home[/FONT]" as the domain anywhere? If so, where should I define it?
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0 philled over 10 years ago in reply to FrankBarmentlo

do you have any dynamic device that does not have a DNS-entry in the UTM yet?

Well, I thought I did, but when I put some examples together to reply to you I think I may have got some more info on the problem.

In my original screenshot attachment there was a server called "ash" with IP 192.168.0.214. So I thought I'd run nslookup on my PC to show how it's not in the DNS and I got these results:

[FONT="Courier New"]C:\Users\Phill>nslookup ash
Server:  UnKnown
Address:  192.168.0.254

*** UnKnown can't find ash: Non-existent domain

C:\Users\Phill>nslookup ash.edwards.home
Server:  UnKnown
Address:  192.168.0.254

*** UnKnown can't find ash.edwards.home: Non-existent domain

C:\Users\Phill>nslookup 192.168.0.214
Server:  UnKnown
Address:  192.168.0.254

Name:    ash
Address:  192.168.0.214[/FONT]

As the last command shows, a reverse DNS lookup is working. The message in the first 2 examples says "[FONT="Courier New"]Non-existent domain[/FONT]", so perhaps the problem is that I haven't defined "[FONT="Courier New"]edwards.home[/FONT]" as the domain anywhere? If so, where should I define it?
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Vote Up 0 Vote Down

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