Your attention, please (specially Amos).
You are assumed to know about SNMPv1, specially about GetNextRequest-PDU
(rfc1157 ).
(Sorry for unformatted message, but Squid-Mail does nnot accept HTML
MIME )
On the Peer Table, just only for some columns
ACTUAL TABLE (SQUID-2)
==================================================================
cachePeerAddress cachePeerName cachePortHttp cachePeerPortIcp
10.0.0.99 blue 80 21
9.1.2.3 yellow 82 24
10.0.0.51 pink 86 19
SCENARIO :
---------
The management station sends to the Squid-SNMP agent a
GetNextRequest-PDU
containing the indicated OBJECT IDENTIFIER values as the requested
variable names:
GetNextRequest ( cachePeerAddress, cachePeerName, cachePortHttp,
cachePeerPortIcp )
The Squid-SNMP agent responds with a GetResponse-PDU:
GetResponse (( cachePeerAddress.9.1.2.3 = "9.1.2.3" ),
( cachePeerName.9.1.2.3 = "yellow" ),
( cachePortHttp.9.1.2.3 = 82 ),
( cacheICPPort.9.1.2.3 = 24 ))
The management station continues with:
GetNextRequest ( cachePeerAddress.9.1.2.3,
cachePeerName.9.1.2.3,
cachePortHttp.9.1.2.3,
cacheICPPort.9.1.2.3 )
The SNMP agent responds:
GetResponse (( cachePeerAddress.10.0.0.51 =
"10.0.0.51" ),
( cachePeerName.10.0.0.51 = "pink" ),
( cachePortHttp.10.0.0.51 = 86 ),
( cacheICPPort.10.0.0.51 = 19 ))
The management station continues with:
GetNextRequest ( cachePeerAddress.10.0.0.51,
cachePeerName.10.0.0.51,
cachePortHttp.10.0.0.51,
cacheICPPort.10.0.0.51 )
The SNMP agent responds:
GetResponse (( cachePeerAddress.10.0.0.99 =
"10.0.0.99" ),
( cachePeerName.10.0.0.99 = "blue" ),
( cachePortHttp.10.0.0.99 = 80 ),
( cacheICPPort.10.0.0.99 = 21 ))
GetResponse (( ipRouteDest. = "10.0.0.99" ),
( ipRouteNextHop.10.0.0.99 = "89.1.1.42" ),
( ipRouteMetric1.10.0.0.99 = 5 ))
PROPOSED NEW TABLE (SQUID-3)
==================================================================
The new one would look like:
cachePeerAddress cachePeerName cachePortHttp cachePeerPortIcp
10.0.0.99 blue 80 21
2001:32ef:a221:fb32::1 yellow 82 24
10.0.0.51 pink 86 19
Routines engaged
================
1.- addr2oid.
How to encode an IPv6 addr into an OID (Object Identifier) ?
Encoding every byte in network order, let it be 4 or 16 .
IPv4 : ( d.d.d.d where every d is a byte, 0-255 0xFF)
10.0.0.99
====>
10.0.0.99
IPv6 : (every two hex-digits are a byte )
2001:32ef:a221:fb32::1
=======> (non abreviated form)
=======> 20:01:32:ef:a2:21:fb:32:00:00:00:00:00:00:00:00:OO:01
=======> 32.1.50.239.162.33.251.20.50.0.0.0.0.0.0.0.0.0.1
2.- oid2addr .
How to decode an OID into an IPv6 addr ?
Reverting step. You must know if an OID holds an IPv4 or IPv6 address.
Of course, we miss the visual representation of an IPv6 OID do noat
coincide with human readable notation (10.0.0.99) , but we can implement
a method to visualaze oid2human , missing now.
3) oi2human (missing).
SCENARIO :
---------
GetNextRequest ( cachePeerAddress, cachePeerName, cachePortHttp,
cachePeerPortIcp )
The Squid-SNMP agent responds with a GetResponse-PDU:
GetResponse (( cachePeerAddress.10.0.0.51 =
"10.0.0.51" ),
( cachePeerName.10.0.0.51 = "pink" ),
( cachePortHttp.10.0.0.51 = 86 ),
( cacheICPPort.10.0.0.51 = 19 ))
The management station continues with:
GetNextRequest ( cachePeerAddress.10.0.0.51,
cachePeerName.10.0.0.51,
cachePortHttp.10.0.0.51,
cacheICPPort.10.0.0.51 )
The SNMP agent responds:
GetResponse (( cachePeerAddress.10.0.0.9 =
"10.0.0.99" ),
( cachePeerName.10.0.0.99 = "blue" ),
( cachePortHttp.10.0.0.99 = 80 ),
( cacheICPPort.10.0.0.99 = 21 ))
The management station continues with:
GetNextRequest ( cachePeerAddress.10.0.0.99,
cachePeerName.10.0.0.99,
cachePortHttp.10.0.0.99,
cacheICPPort.10.0.0.99 )
The SNMP agent responds:
GetResponse
(( cachePeerAddress.32.1.50.239.162.33.251.20.50.0.0.0.0.0.0.0.0.0.1 =
"2001:32ef:a221:fb32::1" ),
( cachePeerName.32.1.50.239.162.33.251.20.50.0.0.0.0.0.0.0.0.0.1 =
"yellow" ),
( cachePortHttp.32.1.50.239.162.33.251.20.50.0.0.0.0.0.0.0.0.0.1 = 82 ),
( cacheICPPort.32.1.50.239.162.33.251.20.50.0.0.0.0.0.0.0.0.0.1 =
24 ))
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If this rationale is OK for you, I will start to code and commit
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Received on Mon Nov 12 2007 - 08:36:50 MST
This archive was generated by hypermail pre-2.1.9 : Sat Dec 01 2007 - 12:00:05 MST