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Questions tagged [troubleshooting]

For questions requiring troubleshooting assistance with persistent/unresolved problems.

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0answers
6 views

Switched ISPs and no longer have internet access…basic configuration for managed switch? [on hold]

Setup: ISPs router/modem/wifi << netvanta 1531p (managed layer 3 switch) << PC What I do know? Internet was working for devices on the managed switch prior to switching ISPs. When I ...
1
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1answer
38 views

Routing and Switching & network monitoring

hi i am facing problem in juniper switch Model: ex4200-48t ,Junos: 15.1R6.7 . i deploy network monitoring check-MK software. there is showing errors of juniper switch ports and also show in logs file ...
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0answers
43 views

Networking(switching) , network traffic monitoring

Hi I am facing error in juniper switch( Model: ex4200-48t ,Junos: 15.1R6.7). I deploy monitoring software and in monitoring software are generating alarm(error) of juniper switch ports errors WARN ...
3
votes
1answer
140 views

PAT not translating at all

I am studying for my CCENT. I threw together a PAT practice lab. Other than DHCP and RIP everything is pretty stock. No VLANs No security Just NAT overload on ACCESS router. I am stumped why it isn'...
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0answers
14 views

Troubleshooting slow connections in large data centers [closed]

I’ve been asked this question - or a variation of it - during some recente job interviews. I think my answers were adequate (involving reducing scope, packet tracer with many probes, etc) but I’m ...
2
votes
2answers
101 views

What can I infer about a network connection using a cable tester (if anything)

I have a NS-468 cable tester for testing cables. This works fine but if I connect just one end of a RJ45 cable to a network, I only get 4 lights. This seems reasonable as I suppose 4 pins are for ...
2
votes
1answer
139 views

Fix our Cisco switch overwhelmed by console logging

I have a setup with dual redundant Cisco catalyst 4506-E using the WS-X45-SUP8L-E supervisor engine and two 48-port switches below it. My task is to access and modify the switch configuration. ...
1
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0answers
29 views

Internet not working [closed]

I have this types of network in my office. Recently we have moved to new i BSNL internet. My problem is when i bypass router and connect poe cable to computer internet is working but when i put ...
0
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1answer
68 views

Cisco: Router can ping Internet, Clients cannot

I'm currently playing around with a Cisco 819 LTE-integrated (C819G-4G-G-K9) router at my summer place to get a better LTE-signal and control that the ISP router provides me. Currently I'm stuck at ...
2
votes
1answer
461 views

Intermittent periods of high packet loss, one hop beyond router

I've been trying to diagnose internet connection issues at a remote small business for which I am the system administrator. If this is not the proper Stack Exchange to post to, I'd really appreciate ...
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0answers
45 views

Show repo <repo> is showing as empty

I'm trying to back up a Cisco ISE server via sftp. I configuered a repo via the web gui. I added the hostkey (for the backup server) via the command line. Started the backup via the web gui using the ...
1
vote
1answer
232 views

arp or proxy-arp causing high cpu

We have an issue on a Cisco A901-6CZ-F-A with high cpu caused by Arp requests coming on Vlan11 from our customer. We enabled 'debug arp' to try and diagnose, below is a small snippet. IP addresses ...
0
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1answer
58 views

What are the “next steps” to take when business Internet service stops working? [closed]

Scenario (based on real events) a small business has a "BigCorp" Internet service. One day the Internet goes down after a power outage, and they call BigCorp for help. BigCorp support over the phone ...
0
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2answers
51 views

Cat 5e wiring Type A incompatibility with Type B

I am not an engineer but I’m having problems with my small network in my business. I have 11 computers after 13 yrs am having major problems. My network keeps shutting down, and my dental software on ...
0
votes
1answer
339 views

Do I have to reboot the Fortigate 1000c after modification on static route?

I am using a Fortigate 1000c working on NAT mode. It has two WAN connections (WAN1 and WAN2). I am using a static route. For some reasons, There are many firewalls and routers (Cisco, TP-Link and so.....
1
vote
2answers
337 views

ASA not passing traffic

I hate posting things like this, but we're backed into a corner here. We recently had a new client ask us to set up an ASA for their branch office 800 miles away. A colleague and I spent last night ...
0
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1answer
127 views

Poor bandwidth after re-coupling an Ethernet cable

As part of an experiment I cut a Cat 5e Ethernet cable in half, stripped off a small amount of insulation on each wire and attached each pair of wires together with its own alligator clip. There are ...
0
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1answer
117 views

Can't connect to FTP [closed]

I am using Beetel 777VR1 with Airtel Broadband. I am trying to connect with a FTP server but I am not able to access that. However with same credentials when I try to connect with my mobile ...
1
vote
1answer
795 views

how to capture only SMTP using latest Wireshark 2.2.6 or later

I am debugging a problem with my Azure VM Windows server receiving SMTP from the Internet, and want to use Wireshark to show ONLY SMTP. I would also like to use Wireshark to show the contents of the ...
2
votes
1answer
556 views

Adding encrypted password on Cisco 3560-CG switch

I'm trying to update the enable secret and account password on a Cisco3560-CG switch with an encrypted password shared by devices throughout the company. I use the following command for the enable ...
1
vote
1answer
52 views

Consistent no route to host errors on servers

Servers configured with DHCP have a default route in the corporate network. Every time a "new" host is connected, a "no route to host error" is received. The second request after a few seconds works ...
1
vote
1answer
148 views

Help me understand this netstat report

I am IT admin, and I got this report from a user. Can you help me understand the TCP connection entry to to this doubleclick Foreign Address? Is it a concern for the end user/organization? What could ...
1
vote
1answer
521 views

DMVPN Tunnel Spoke sending registration requests but Hub does not get it

I have built a topology in GNS3 with five routers with a goal to perform: 1)inter vrf routing with bgp as the routing Protocol between Routers. 2)build DMVPN tunnel on the top of it. I was ...
1
vote
2answers
295 views

How to verify Voice QoS dscp and IP predecence traffic session?

How can I verify tht QoS is working for voice traffic? I also have voice server IP address. Can I also know what the session source/dest/port number info? class-map match-all avaya match access-group ...
0
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2answers
183 views

Time exceeded ICMP in Serial Interface [Cisco Router 2811]

R1 and R2 are the same network. But when you send a check to the ICMP Ping output "Time exceeded" error and, show interface Serial0/0/0 command produces the following output: Serial0/0/0 is up, ...
0
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1answer
516 views

Juniper EX4200 firewall filter applied to trunk port not matching specific VLAN

EX4200 switch has a firewall filter applied to input of trunk port. Intent is to rate-limit (police) input bandwidth per VLAN id. However the 'show firewall' command points out that policing is ...
1
vote
1answer
56 views

Cisco AIRONET 700 loses connection while downloading

We have three of them, but one is messing around. As soon as you download a bigger file, he loses connection. I can't ping the AP (from another PC connected via LAN), and the PC connected via Wi-Fi ...
1
vote
2answers
209 views

Cisco CoreSwitch 6509 Vlan connection problems

just wanted to ask what measures I'll have to do regarding on my problem on CoreSwitch 6509. I have 12 vlans on layer 3 switch which has 48 ports, 4 ports per vlan and I have a backbone on vlan 10 and ...
1
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2answers
145 views

Cisco ASA 5505 ver 8.2 Firewall

I am working on a project to allow ICMP through the firewall from the outside interface to an inside interface. I have configured the firewall to inspect icmp and allowed icmp through access-list ...
0
votes
1answer
607 views

Is there a way to automatically have unused ports disable?

Like many others I can see how to display ports that have no traffic flowing through them and go through and disable them but we have hundreds of cisco switches. I like the idea of being able to see ...
0
votes
2answers
131 views

Cisco 1800 series: sys-2-chunkexpanfail: error every time

My knowledge of Cisco is very basic and I´m having this error constantly. I have to reboot every time, and it does not seem right. How can I solve it at once?? What I know of this device is that it ...
0
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1answer
360 views

Which is the actual TCP MSS for this iBGP connection on ASR9K running IOS-XR?

I have this iBGP session established between a Cisco ASR9K and a Cisco 7600 router. On the ASR9K device, 'show tcp detail pcb all' displays 'MSS 1240, peer MSS 9152, min MSS 1240, max MSS 1240' for ...
3
votes
1answer
124 views

Can't copy files within ERX

I use FileZilla FTP client to connect to my equipment in order to get files from there. I tried same process in my ERX, without success. Below is a view of my directory bras-2.cm#dir Please wait... ...
0
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1answer
227 views

How to collect core dump files in Juniper ERX

For troubleshooting purposes, I need to collect some files from my ERX.(by ftp) Below is the content of my directory ERX#dir *** Active/standby file systems are being synchronized. *** ...
1
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0answers
625 views

Problems connecting to clientless vpn portal on a Cisco ASA 5505

Just started a job where they wanted us to re-purpose a local network that wasn't in use and to create a webvpn portal to allow web access to it. We've tried everything and looked every where and ...
0
votes
1answer
23 views

virtual box to other virtual box connectivity issue [closed]

I am creating a cluster setup on virtual boxes. I have Ubuntu 14.4 installed in all systems. Both the systems are having virtual box installed. I have changed the ip-address to static on both ...
1
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0answers
681 views

TCP retransmissions when we rapidly open multiple connections to the same host

We are experiencing a retransmission issue on some of our computers on our LAN, when connecting to external hosts. I first started trying to trace the issue when the npm typings install command was ...
1
vote
4answers
589 views

Sniffing a Device's Traffic on LAN

There is a device on my network connected via ethernet. Seeing as how hubs are hard to find or ridiculously expensive these days, what hardware can I use if I'm interested in sniffing the traffic to/...
0
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1answer
87 views

Is it possible to tell if a firewall is present on my network path?

If I am sitting at the command line of a host and have an IP and port for a destination, is there any way to tell if the network path involves a firewall, or if it's being evaluated by a ruleset of ...
1
vote
3answers
22k views

Output drops/errors on Cisco 3850

Sorry if this is a noob-ish question, but I am a bit lost. We are currently having some network issues, that seem to be manifesting in what appear to me to be odd ways. End result is I have some ...
0
votes
1answer
492 views

Three SG220-50P switches are rebooting randomly every few hours or days

We have three small business PoE switches, SG220-50P purchased from two places. They are each randomly rebooting at different times every few days, and sometimes only after a few hours. They have been ...
2
votes
3answers
2k views

Can't Ping INTERNET from clients but I CAN from Internal Routers

I have a gateway rv320 cisco(lets name it BR) and inter router Cisco 1921 (lets name it RTR) i was having trouble pinging the lan port on the BR from my hosts, but someone helped me fix that issue. ...
0
votes
1answer
35 views

Mixed Use Four-pair Cable

My school tried to save money, so they decide to use an installed cable for phone, CCTV, and ethernet. I used two pairs for ethernet, one for phone, and one for a CCTV camera. The phone and camera ...
0
votes
1answer
100 views

Trouble connecting a small network.. pinging

RTR configuration: service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname T-RTR ! boot-start-marker boot-end-marker ! ! enable secret 5 $...
2
votes
2answers
1k views

Multicast doesn't get forwarded correctly [closed]

I have a problem with UDP-Multicast with Kubernetes: I have to Kubernetes-Nodes each of them running a pod: Kubernetes-Node-1: - eth0: 192.168.0.2/24 - docker0: 10.1.1.1/24 Pod1 on Kubernetes-...
2
votes
2answers
1k views

I can't ping 8.8.8.8 from 2960 L2 switch?

I have new 2960 L2 switch, I can't ping 8.8.8.8 from switch but having internet on clients that connected to same switch
1
vote
2answers
211 views

Will wifi networks on same 2.4GHz channel conflict if only 1 is being used?

I think this is a simple yes/no question but I may be wrong. I work in a warehouse sized building where 4 networks are broadcasting but only 1 is being used, as in, no one logs in to the other ...
2
votes
1answer
47 views

Different responses IP and domain name [closed]

I have a domain name that is using a public IP, when I send two requests, one to the domain name and one to the IP I get different headers in each one, in one of them 4 cookies are set, in the other ...
1
vote
1answer
27 views

MLPPP_Bundle_load sharing

I have configured one MLPPP bundle with 6 E1`s. One of them getting utilize more than 80% while other one are just only 5 or 10 % utilize. How can i overcome from such issue.
10
votes
3answers
28k views

How to verify that a UDP port is open? [closed]

I have here a dilemma. I have a device that communicates to another remote device but there is a firewall between them. It's a UDP connection, so TCP utilities don't work to test if the specific port ...