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Visitor
NChiba
Posts: 5
Registered: ‎09-06-2010
0

SRX100H No Internet without ping

Hi,

We not so long bought new Juniper SRX100H for our office and now there is strange problem. When i login by ssh on device and begin ping my default gateway  then internet works on all computers in NAT, when i interrupt default gateway ping after that approximately in 1 minute internet disconnected. Anybody didn't have such problem? How it can be resolved? 

Visitor
ehomo
Posts: 6
Registered: ‎01-22-2009
0

Re: SRX100H No Internet without ping

Hi.

 

It seems that you are loosing arp-cache in some way.  Try  'show arp no-resolve' command next time when you experience problems.

Visitor
NChiba
Posts: 5
Registered: ‎09-06-2010
0

Re: SRX100H No Internet without ping

root@sg01> show arp no-resolve

MAC Address       Address         Interface     Flags

00:xx:xx:78:a7:f5 xxx.xxx.xxx.81     fe-0/0/0.0         none

00:22:b0:04:18:cd 192.168.1.6     vlan.0               none

Total entries: 2

 

Looks like here all ok, but no ping, no internet :smileysad:

Recognized Expert
aweck
Posts: 255
Registered: ‎07-24-2009
0

Re: SRX100H No Internet without ping

My guess is that you may have another device on Internet-side L2 network that poisoning your gateway's ARP table.  You may want to contact your ISP and have them verify what ARP entry they show when you are not pinging the gateway.

Juniper Elite Partner
JNCIE-ENT #63, JNCIE-SP #705, JNCIE-SEC #17, JNCIS-FWV, JNCIS-SSL
Visitor
NChiba
Posts: 5
Registered: ‎09-06-2010
0

Re: SRX100H No Internet without ping

ISP said, that they can't see SRX in the network at all. As though it isn't connected generally. When i'm pinging gateway and when not, situation the same.

Trusted Contributor
rfrederick
Posts: 213
Registered: ‎07-14-2008
0

Re: SRX100H No Internet without ping

You could try asking your ISP to add a hard arp entry for your SRX MAC and external IP address in order to see if there is indeed another device responding to ARP requests for your external IP address.

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