snmpwalk and ipv6 address

Pushpa Thimmaiah

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Nov 3, 2015, 7:39:39 AM11/3/15

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Hi Folks,

I am using ubuntu and ifconfig eth0 says 'inet6 addr: fe80::3e97:eff:fe8b:f326/64'

I have tried snmpwalk with ipv6 ipaddress (mentioned below) and it works fine
snmpwalk -v 2c -c public1 'udp6:[::1]:161'

But snmpwalk fails when i used fe80::3e97:eff:fe8b:f326

$ snmpwalk -v 2c -c public1 "udp6:[fe80::3e97:eff:fe8b:f326]:161"
Timeout: No Response from udp6:[fe80::3e97:eff:fe8b:f326]:161

snmpget -v 2c -c public1 udp6:'[fe80::3e97:eff:fe8b:f326%eth0]':161 .1.3.6.1.2.1.1.1.0
Timeout: No Response from udp6:[fe80::3e97:eff:fe8b:f326%eth0]:161.

Details:

1. ping works
$ ping6 -c 5 -I eth0 fe80::3e97:eff:fe8b:f326
PING fe80::3e97:eff:fe8b:f326(fe80::3e97:eff:fe8b:f326) from fe80::3e97:eff:fe8b:f326 eth0: 56 data bytes
64 bytes from fe80::3e97:eff:fe8b:f326: icmp_seq=1 ttl=64 time=0.034 ms
64 bytes from fe80::3e97:eff:fe8b:f326: icmp_seq=2 ttl=64 time=0.047 ms

2. snmpagent listening to ipv6 address and community name 'public1' is ipv6
rocommunity6 public1 default
agentAddress udp:161,udp6:[::1]:161,tcp:161,tcp6:[::1]:161

3. ipv6 enabled
~$ net-snmp-config --configure
'--build=x86_64-linux-gnu' '--includedir=/usr/include' '--mandir=/usr/share/man' '--infodir=/usr/share/info' '--localstatedir=/var' '--libexecdir=/usr/lib/net-snmp' '--disable-maintainer-mode' '--disable-dependency-tracking' '--prefix=/usr' '--sysconfdir=/etc' '--mandir=/usr/share/man' '--with-persistent-directory=/var/lib/snmp' '--enable-ucd-snmp-compatibility' '--enable-shared' '--with-cflags=-g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -DNETSNMP_USE_INLINE' '--with-perl-modules=INSTALLDIRS=vendor' '--enable-as-needed' '--enable-ipv6' '--with-logfile=none' '--without-rpm' '--with-libwrap' '--with-openssl' '--without-dmalloc' '--without-efence' '--without-rsaref' '--with-sys-contact=root' '--with-sys-location=Unknown' '--with-mib-modules=host smux ucd-snmp/dlmod ucd-snmp/diskio ucd-snmp/lmSensors host' '--with-out-mib-modules=' '--enable-mfd-rewrites' '--with-mnttab=/etc/mtab' '--with-mibdirs=/home/test/.snmp/mibs:/usr/share/mibs/site:/usr/share/snmp/mibs:/usr/share/mibs/iana:/usr/share/mibs/ietf:/usr/share/mibs/netsnmp' '--with-defaults' 'build_alias=x86_64-linux-gnu' 'CFLAGS=-g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security' 'LDFLAGS=-Wl,-Bsymbolic-functions -Wl,-z,relro' 'CPPFLAGS=-D_FORTIFY_SOURCE=2'
pushpa@CLPMYSFC067:~$

Please let me know for more details

Thank you,

Pushpa.T

Pushpa Thimmaiah

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Nov 3, 2015, 7:39:39 AM11/3/15

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Bill Fenner

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Nov 9, 2015, 1:57:01 PM11/9/15

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You configured snmpd to listen on ::1, but you asked fe80::3e97:eff:fe8b:f326. It's not listening on fe80::3e97:eff:fe8b:f326, so it will not respond. As you say, when you make your request to ::1, it works.

"udp6:[::1]:161" is the equivalent of "udp:127.0.0.1:161". If you want to listen to the wildcard, you don't specify an address -- just use "udp6:161".

Bill

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Pushpa Thimmaiah

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Nov 10, 2015, 2:14:57 AM11/10/15

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Thank you Bill Fenner. I will try the same.