Hi, you please explain what does the below line means in snmpd.conf ? " proxy -Cn ctx_remote -v1 -c public <ip of node2>:161 .1.3.6.1 " ctx_remote is defined by the line :- com2sec -Cn ctx_remote notConfigUser default cmty_remote1
On node 1 when I run "snmpget -v1 -c cmty_remote1 localhost SNMPv2-MIB::sysName.0 " , I get the sysName of Node2 even though I have mentioned " localhost " in command. Can you please clarify what is the flow here? where the request goes, who receives it, who sends the response here? Also what exactly does "com2sec -Cn ctx_remote notConfigUser default cmty_remote1" means? A high level overview of this scenario will be highly appreciated. Regards Nishant On Mon, 6 Sept 2021 at 19:26, Bill Fenner <fen...@gmail.com> wrote: > On Sun, Sep 5, 2021 at 9:59 AM Nishant Nayan <nayan.nishant2...@gmail.com> > wrote: > >> My aim is to know how various parameters like errorstat and errindex etc. >> are set from response. >> >> For an example command : >> snmpget -v1 -c cmty_remotehost1 localhost SNMPv2-MIB::sysName.1 >> SNMPv2-MIB::sysDescr.0 SNMPv2-MIB::sysObjectID.0 >> >> SNMPv2-MIB::sysName.1 being an incorrect oid >> > > I like to add "-Ddumpv,dumph" to get details of the messages that are > being send and received. Try running your get with that debugging to see > if the output helps you understand where each field comes from. (You can > change it to just "-Ddump" to also get a hex dump, which you may be able to > compare with the data field you see in your debugger). > > Each field in the packet is encoded using ASN.1, which is more or less a > type/length/value encoding, but is fairly complex. If you're trying to > create your own packets, please see if it's feasible to use an existing > ASN.1 encoder, because there have historically been many bugs in ASN.1 > parsing and encoding so it's best to use a well-tested implementation. > > Also, if you want to know what the SNMP protocol is doing, as opposed to > what the helpful snmpget command is doing, you should add "-Cf" to the > snmpget command line - when snmpget gets an error like this, it'll strip > out the bad object and try again so that it gets the data that may exist, > but that is not how SNMP works per se - that is how snmpget works. > > Bill > >
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