Hello,
When using "address X.Y.Z.W/TV" definition, the net and bcast IPs are
NOT used and JUNOS carves them out.
When using "address-range low X.Y.Z.W high X.Y.W.U", ALL addresses are
used and JUNOS does NOT carve the net and bcast IPs out.
Whether You _should_ use net and bcast IPs - it depends on the app mix.
Some legacy apps such as eMule frown upon IPs ending with 0 (i.e. net IP
for /24), and gives them "low id"
https://en.wikipedia.org/wiki/EMule#Low_ID
HTH
Thanks
Alex
On 20/04/2016 17:11, Aaron wrote:
Awesome Alex, good find !
So I wonder if the high-cpu issue with the all-zero and all-ones
address of the named subnet means that when using address-range that
the net-id and bcast address for the low/high definition will NOT be
used in the nat pool ? …or that net-id and bcast addresses WILL be
used for nat translations ?
Thanks again
agould@eng-lab-mx104-cgn# show | compare
[edit services nat pool nat1]
- address 1.2.3.128/25;
[edit services nat pool nat1]
+ address-range low 1.2.3.128 high 1.2.3.255;
agould@eng-lab-mx104-cgn# run show route advertising-protocol bgp
10.101.0.2 table one.inet.0
one.inet.0: 771 destinations, 1915 routes (771 active, 0 holddown, 0
hidden)
Prefix Nexthop MED Lclpref AS path
* 10.144.2.4/30 Self 100 I
* 1.2.3.128/25 Self 100 I
[edit]
*From:*Alexander Arseniev [mailto:arsen...@btinternet.com]
*Sent:* Wednesday, April 20, 2016 1:36 AM
*To:* Aaron <aar...@gvtc.com>; juniper-nsp@puck.nether.net
*Subject:* Re: [j-nsp] cgnat on service module - interesting bgp
advertisements
Hello,
MS-MIC (and MS-MPC NPUs as well) automatically cuts out network (in
your case .128) and broadcast (in your case .255) IPs.
The rest cannot be expressed as single prefix, hence a bunch of
smaller prefixes is annonced instead.
This was done as PR 1019354 fix
https://prsearch.juniper.net/InfoCenter/index?page=prcontent&id=PR1019354
HTH
Thx
Alex
On 20/04/2016 00:48, Aaron wrote:
Very interesting. anyone know why this is happening ? Is this documented ?
I put a /25 as the public nat pool, but look what this mx104 is advertising
via bgp.. It appears to chop up that /25 into a bunch of smaller subnets and
advertise those out
agould@eng-lab-mx104-cgn> show configuration | grep 1.2.3. | display set
set services nat pool nat1 address 1.2.3.128/25
agould@eng-lab-mx104-cgn> show route advertising-protocol bgp 10.101.0.2
table one.inet.0
one.inet.0: 782 destinations, 970 routes (782 active, 0 holddown, 0 hidden)
Prefix Nexthop MED Lclpref AS path
* 10.144.2.4/30 Self 100 I
* 1.2.3.129/32 Self 100 I
* 1.2.3.130/31 Self 100 I
* 1.2.3.132/30 Self 100 I
* 1.2.3.136/29 Self 100 I
* 1.2.3.144/28 Self 100 I
* 1.2.3.160/27 Self 100 I
* 1.2.3.192/27 Self 100 I
* 1.2.3.224/28 Self 100 I
* 1.2.3.240/29 Self 100 I
* 1.2.3.248/30 Self 100 I
* 1.2.3.252/31 Self 100 I
* 1.2.3.254/32 Self 100 I
Aaron
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