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Strange restrictions in SA540

Hello,

I have upgraded my SA540 to firmware version 2.2.0.7 and I want to set the router again.

Somewhat I cannot set it exactly how it was. I have 10.0.0.0/16 network inside my company divided to 10.0.0.x for servers and other static IPs and 10.0.1.x for DHCP.

Cisco don't let me choose 10.0.1.0 as a starting address for DHCP pool. In my opinion 10.0.1.0 is valid address for a host in 10.0.0.0/16 network.

See this screenshot:

http://webdev.fit.cvut.cz/~myslivo1/obrazky/a%20-%20octet.th.png

OK this one address don't bother me much but I think that this is a bug. Someone didn't realize that 0 in last octet can be valid address...

The second thing is worse for me. As I said, I have the address range 10.0.1.0 - 10.0.1.254 for DHCP pool. Then I want to set DHCP reserved addresses which are i.e. 10.0.0.10 (third byte is different in each of my reserved IPs).

Cisco won't let me set these addresses for reservation with error message that the addresses overlaps. See screenshot:

http://webdev.fit.cvut.cz/~myslivo1/obrazky/b1%20-%20%20address%20range.th.png http://webdev.fit.cvut.cz/~myslivo1/obrazky/b2%20-%20reserved.th.png

But in real, they can't overlap. 10.0.0.10 can't overlap with any of 10.0.1.xxx addresses!

This error really bother me because I can't set the router how my network is designed.

How can I handle this? Any idea?

I want to mention that I have this settings on earlier version of FW on the same device.

Thank you for replies.


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5 REPLIES

Strange restrictions in SA540

The IP your trying to reserve is not in your DHCP Scope so it can't reserve it as it wouldn't normally assign it.  In order to reserve and IP via DHCP to be applied to a give MAC, the IP must be within the range of DHCP assignable addresses.  Since 10.0.0.10 isn't in the range of 10.0.1.1 - 10.0.1.254, it can't reserve it.  If that worked previously, then the bug was in the previous version as what you are trying to do should not be allowed.  Please let me know if this all makes sense or if you need further clarification.  I hope it's helpful.

Shawn Eftink
CCNA/CCDA

Please rate all helpful posts and mark correct answers to assist others searching for solutions in the community.

Shawn Eftink CCNA/CCDA Please rate all helpful posts and mark correct answers to assist others searching for solutions in the community.
New Member

Re: Strange restrictions in SA540

Thank you for quick reply.

If you are saying that the reserved IPs must be within the DHCP pool I think that you are not right.

Firstable look on the error message in the third screenshot it says: "Reserved IP Address must not be in the DHCP Server Range of LAN". Which means opposite that you have wrote.

Secondary I made some other testing. I set the address range to 10.0.1.100 - 10.0.1.254 and then try to add some reserevations. Look at those screenshots:

http://webdev.fit.cvut.cz/~myslivo1/obrazky/c1.th.PNG http://webdev.fit.cvut.cz/~myslivo1/obrazky/c2.th.PNG http://webdev.fit.cvut.cz/~myslivo1/obrazky/c3.th.PNG

I cannot add 10.0.1.100 address (which is within the range) but I can add both 10.0.1.10 and 10.0.0.10. It looks like that the restriction are not made well and it compares just the last byte.

If I am right, it seems to be a great bug in simple networking rules, isn't it?

Strange restrictions in SA540

Vojtech,

Hmmm.  I think you might be correct and this is a bug.  When I had originally read the error message from your second screen shot, I read it as a reason it wasn't working rather than directions on what must be done to make it work...if that makes any sense.

Anyway, seeing that you have a DHCP scope of 100-254, can add 0.10 and 1.10 but not 1.100 and previously could not add 0.10 when the scope was 1-254, it does appear that the code may be looking at the last octet only.  I think you found a bug.

Shawn Eftink
CCNA/CCDA

Please rate all helpful posts and mark correct answers to assist others searching for solutions in the community.

Shawn Eftink CCNA/CCDA Please rate all helpful posts and mark correct answers to assist others searching for solutions in the community.
New Member

Strange restrictions in SA540

Thanks for supporting my thoughts Shawn.

Where should I report this bug? Does anyone eligible reads this forums? An d how long do you think it will take to repair this bug? This error hinder me a lot

Re: Strange restrictions in SA540

You can contact SMB Support to open a ticket so they can create a bug report.

http://www.cisco.com/en/US/support/tsd_cisco_small_business_support_center_contacts.html

It's hard to say how long it will take to fix, but I would be thinking months over weeks.

Sent from Cisco Technical Support iPhone App

Shawn Eftink CCNA/CCDA Please rate all helpful posts and mark correct answers to assist others searching for solutions in the community.
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