Questions tagged [troubleshooting]

For questions requiring troubleshooting assistance with persistent/unresolved problems.

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HELP ME: CISCO ROUTER CONFIGURATION [closed]

am a joiner in network and now the company bring the cisco router 2900 to me for configure the network, please need your help for configuration: Model: cisco router 2900 IP: 37.224.119.XX/31 getway: ...
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34 views

Eigrp flapping while using natting with route map

I have configured a topology which contains ip sla , route map , dual natting.It work perfect but when I used route map natting the eigrp become flapping and show the error is "retry limit ...
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0answers
16 views

Cisco Kron Job starts later and later

I use a Kron job to ring a shit bell for our manufacturing plant. The application works, but the job starts 35+ seconds late. The problem seems to be getting worse, a few days ago it was at 35 secs ...
2
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3answers
346 views

How can you determine the result of a load-balancing hashing algorithm (such as ECMP/LAG) for troubleshooting?

In many architectures there are load-balancing mechanisms such as ECMP routing or LAG between various interfaces. This load-balancing is usually per-flow, based on a hash of various criteria, such as ...
0
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1answer
72 views

Does Telnet need to be activated on both devices I am using or not? [closed]

I've searched everywhere for the answer to this question but can't find a simple yes or no. Basically, I have a virtual server hosting some services and then a physical panel PC in another part of the ...
1
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2answers
50 views

Steps on troubleshooting a network

If I have to troubleshoot a network stating that one of the interface is not working (i.e, a link is down), what steps would I need to take to make it working again?
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0answers
214 views

NAT overload and access to web resources

I have really bizarre problem in clients network. Clients have access to the internet via NAPT - I'm using several public ip addreses for this purpose. (I'll change ip addresses for obv reasons) ip ...
5
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2answers
92 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
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1answer
750 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 ...
2
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0answers
930 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
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1answer
48 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 ...
1
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1answer
825 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
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1answer
331 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 ...
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1answer
3k 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
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1answer
97 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 ...
4
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2answers
332 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
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0answers
31 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 ...
1
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2answers
341 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
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1answer
798 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
65 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
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1answer
375 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
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1answer
1k 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
661 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
74 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
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2answers
119 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
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2answers
539 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
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2answers
652 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
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2answers
971 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
2k 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
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1answer
2k 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 ...
3
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1answer
1k 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
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1answer
80 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
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1answer
478 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
968 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
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2answers
689 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
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2answers
218 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
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1answer
799 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
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1answer
67 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
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2answers
263 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 ...
3
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2answers
232 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
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1answer
2k 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
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2answers
237 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
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1answer
718 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 ...
2
votes
1answer
161 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... ...
1
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1answer
553 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. *** ...
2
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0answers
886 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
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1answer
31 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
1k views

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

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
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4answers
792 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
336 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 ...