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Questions tagged [troubleshooting]

For questions requiring troubleshooting assistance with persistent/unresolved problems.

5
votes
2answers
62 views

Cisco 2821 hangs with “No memory”

I have one (pretty old) 2821 router, running BGP with 2 ISPs. (C2800NM-ADVENTERPRISEK9_IVS_LI-M), Version 12.4(24)T5 Sometimes for unknown reason it just hangs, and as it is remote location I cannot ...
6
votes
1answer
280 views

Bandwidth limit Cisco 3400 ME problem

I want to limit bandwidth (speed) of interface of Cisco 3400 ME switch. I did these: policy-map parent class class-default shape average 64000 And in gi0/2 interface I apply it: service-policy ...
1
vote
0answers
82 views

Point to Point ICMP Ping Loss between Juniper MX routers

I am facing problem with regard to 1 x 10G link (which is actually configured as an aggregated Ethernet (ae) i.e ae link contains only single 10G link. This ae link is connected between 2 x Juniper ...
2
votes
1answer
33 views

How do I find out which NAT is getting hit?

I can see in packet captures that my packet's destination IP is getting translated. How do I find which NAT statement is responsible for the conversion if my device has over 200 NAT rules? I'm using ...
0
votes
0answers
37 views

Why can't I ping to the outside interface of my ASA

Below is the output of packet tracer. I have simulated a ping packet from 10.106.51.203 to 10.106.51.200. 'mgmt' is supposed to be the outside interface. Also, why is output-interface in the result ...
1
vote
1answer
137 views

Cisco 49XX multicast flooding

I have problem with multicast on cisco 4948. I've got vlan 9 with muilticast, which configured on several ports. Switch floods multicast traffic on all ports configured with vlan 9. It consumes link ...
3
votes
1answer
68 views

Cisco Router IOS update

I am facing problem in update the IOS of Cisco 7304 router. I am upgrading from 12.4(24)T2, to 15.2(4)S7 this. but I was boot from this version 15.2(4)S7 it booted proper from flash. But when I put ...
0
votes
1answer
63 views

How to Troubleshoot Network Latency Step by Step

Does anyone have an idea of how to troubleshoot high network latency step by step? For example, let's say we have a remote office. And all users are from that office are having high latency accessing ...
2
votes
1answer
55 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 ...
3
votes
1answer
149 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'...
1
vote
0answers
20 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
121 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 ...
3
votes
1answer
249 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
vote
0answers
33 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 ...
1
vote
1answer
105 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
605 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 ...
2
votes
1answer
390 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
votes
1answer
67 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 ...
1
vote
2answers
66 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
401 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.....
2
votes
2answers
387 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 ...
1
vote
1answer
212 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
votes
1answer
339 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 ...
2
votes
1answer
1k 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
709 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
62 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
183 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
646 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
388 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 ...
1
vote
2answers
195 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, ...
1
vote
1answer
576 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
59 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 ...
2
votes
2answers
232 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 ...
2
votes
2answers
162 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
889 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 ...
1
vote
2answers
147 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 ...
1
vote
1answer
448 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
136 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
votes
1answer
305 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
vote
0answers
722 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
28 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
vote
0answers
1k 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
679 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/...
1
vote
1answer
91 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
25k 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
523 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
38 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 ...
1
vote
1answer
103 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
2k 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-...