Category Archives: Networking

Linux : How to change default route metric

Under some rare circumstances, you may require to change the default route metric. The first way of doing should be through the “ifcfg-ethX” configuration file by adding the “METRIC=” statement. However it has been found to be inefficient for me and had to apply it using “ip route” as followed :

ip route del default via <your.default.gateway.ip> dev <interface> proto static metric <current.metric>
ip route add default via <your.default.gateway.ip> dev <interface> proto static metric <new.metric>

1 2	ip route del default via <your.default.gateway.ip> dev <interface> proto static metric <current.metric> ip route add default via <your.default.gateway.ip> dev <interface> proto static metric <new.metric>

Example :

ip route del default via 1.2.3.4 dev eth0 proto static metric 100
ip route add default via 1.2.3.4 dev eth0 proto static metric 90

1 2	ip route del default via 1.2.3.4 dev eth0 proto static metric 100 ip route add default via 1.2.3.4 dev eth0 proto static metric 90

JunOS : Buffer management parity error detected in mpfe1, value 0, re-init the PFE

Encountering the following error in the logs of your Juniper device? /kernel: Buffer management parity error detected in mpfe1, value 0x4001, re-init the PFE /kernel: Buffer management parity error detected in mpfe1, value 0, re-init the PFE This is most likely pointing toward defective hardware, more specifically memory issue. If this message showed only once,… Read More »

JunOS : Port forwarding on Juniper SRX

A friend of mine who was used to the legacy and EOL SSG/ScreenOS platform and he just jumped into the new world of SRX/JunOS gave me the motivation to write this article. As the syntax is quite different between the two platform, it may be harder to get at first and the following example should… Read More »

JunOS : fpc CMLC: Going disconnected; Routing engine chassis socket closed abruptly

Getting the following error on your Juniper EX/MX/QFX virtual chassis? fpc1 CMLC: Going disconnected; Routing engine chassis socket closed abruptly This message is informational and does not necessary indicate any serious issue, for example in a graceful Routing Engine switchover (GRES) context / if you flipped the routing-engine (RE) on purpose. However if this is… Read More »

UniFi : Access point show disconnected immediately after adoption

I ran into a weird issue trying to adopt several Ubiquiti UniFi AP Mesh Pro access points on a newly created site within the UniFi controller lately. Here is the behavior encountered : – Newly UniFi access point deployed showed up in the controller for adoption ; – Clicking “Adopt” did started the provisioning process… Read More »

JunOS : PoE devices suddenly losing power on Juniper EX4300-48p

If your Power over Ethernet (PoE) device(s) connected to an EX 4300-48p switch suddenly lose power unexpectedly after some time working just fine, you may be experiencing PoE controller software issue. First of all, verify if you are not over your PoE power budget (this could be sometimes the case when you have a LOT… Read More »

JunOS : Configure DNS forwarders on SRX device

If you want your SRX firewall to handle DNS requests on your network, you need to configure the forwarders to make this possible, in addition to a few other parameters. First, make sure you have no local forwarders set on the device itself as it cannot be used along with the dns-proxy service – if… Read More »

JunOS : logger: transfer-file failed to transfer /var/transfer/config/juniper.conf.gz

Having the following log error entry using the archival function to backup your configuration on your Juniper device? logger: transfer-file failed to transfer /var/transfer/config/re0.HostName_juniper.conf.gz_20181129_034459 I have experienced the following, where no further details provided, under the following conditions : – The backup server (ftp, sftp) is reachable and working properly – The credentials to the… Read More »

JunOS : LIBJNX_FILE_SYSTEM_FAIL: /var/transfer/config/: No such file or directory

Encountered such issue in your log file of your Juniper network device? LIBJNX_FILE_SYSTEM_FAIL: /var/transfer/config/: No such file or directory This is most likely related to your configuration archival (backup), with such statement :

set system archival configuration [transfer-on-commit | transfer-interval]
set system archival configuration archive-sites "scp://user@IP_Address/path/to/folder" password "USER_Password"

1 2	set system archival configuration [transfer-on-commit \| transfer-interval] set system archival configuration archive-sites "scp://user@IP_Address/path/to/folder" password "USER_Password"

This is most likely caused by filesystem corruption and/or inexisting transfer folder on the filesystem. To resolve this issue, enter into… Read More »

JunOS : Upgrade return ERROR: Package signature validation failed. Aborting install.

Experiencing the following error while upgrading JunOS? Verify the signature of the new package verify-sig: cannot validate certs.pem certificate is not yet valid: /C=US/ST=CA/L=Sunnyvale/O=Juniper Networks/OU=Juniper CA/CN=PackageProductionRSA_2018/emailAddress=ca@juniper.net ERROR: Package signature validation failed. Aborting install. This error could be caused by incorrect date and time set on your device (back in time). To validate the current value,… Read More »