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Questions tagged [troubleshooting]

For questions requiring troubleshooting assistance with persistent/unresolved problems.

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1
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1answer
211 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
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1answer
741 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
204 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, ...
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-...
1
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1answer
650 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
61 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
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1answer
529 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
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2answers
178 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 ...
2
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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
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1answer
1k 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 ...
2
votes
1answer
145 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
405 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
votes
2answers
7k views

Cisco 3560X Switch MAC reported with same IP as other equipment

We have a network with a bunch of 3560 switches setup and desktops/laptops and some Rockwell Automation equipment connected to them. We had to add a new switch, a 3560X to the network recently to add ...
2
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0answers
781 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
30 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

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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2answers
690 views

ISP router unreachable by PAT

I just configured PAT in a router but it doesn't work ,, I write this commands in R1 access-list 4 permit 172.16.0.0 0.0.255.255 ip nat pool AdeNet 80.80.10.20 80.80.10.20 netmask 255.255....
1
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1answer
94 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 ...
28
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2answers
48k views

What is the meaning of the CRC counter on a cisco device?

If the CRC counter of an interface is high, normally it's a bad sign, but why? If the count is high, what does this mean technically? What can cause this counter to go up? On which layer in the OSI ...
0
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1answer
989 views

Switch: packets lost with certain? traffic

I'm giving you a high-level overview of my problem, no tech details. I'd like to know how to solve this problem. Problem Effect #1 We got a Netapp replacing another NAS. The Netapp is connected to ...
2
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0answers
635 views

Palo Alto Layer 7

I've got the following error for a security policy in PA 3020: L7 processing ; ctd error bypass I tried Googling, but I couldn't find a solution. Does anyone knows the meaning of this? The ...
8
votes
4answers
2k views

Internal BGP route exchange issue

I have BGP multihoming with two cisco routers. Each router has its own ISP and announce our AS with our /24 network to the internet. My issue is between those two routers : Router A, routing table ...
1
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1answer
104 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

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
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2answers
263 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 ...
1
vote
1answer
29 views

MLPPP_Bundle_load sharing [closed]

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.
1
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0answers
46 views

One of my MPLS link is not passing traffic [closed]

I have two MPLS link and one is not passing traffic the other is passing traffic. What can be the cause of it.
1
vote
1answer
69 views

How to assure where the problem is occurring? [closed]

I actually posted this question yesterday. I'm here to ask you guys again after testing. ↓↓↓First of all, please see my question↓↓↓ My customers told me that the access speed is really slow markedly!...
2
votes
1answer
72 views

Site-to-Site VPNs

I'm having some problems with our networks and I'm wondering if anyone has some ideas. We have recently moved to a cloud server (we went with UKFast) to host our network - it's main use is for the ...
1
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0answers
266 views

Effects of ip options drop command on Cisco 4507 Device

Are there any services or applications traversing a router that will be impacted by the command, "ip options drop"? I know the router warns about RSVP when you input this command, but this 4510 is not ...
2
votes
1answer
325 views

Static NAT using IP address from different address space

How to do NAT if I need translate PC IP to IP address f.e. 130.130.130.130? I set ip nat inside and ip nat Outside interface and there is also OSPF between routers and server. I use ip nat inside ...
1
vote
2answers
522 views

can switch make lan slow [closed]

i have network in my office which i roughly described in images. pc1(Ethernet) and laptop(via wifi) is connected directly to router, and pc2 and pc3 is connected via switch in both in Ethernet. when ...
1
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1answer
843 views

How to find the end-device causing high cpu usage in a Cisco switch? [closed]

While checking: sh proc cpu history there is high CPU utilization which occurs at a particular time.
1
vote
1answer
3k views

Input packet drops on port channel

I have a certain number of packets dropped on my port channel interface with 3gbps bundled speed, on Cisco 6500 with Sup 720. You can see underneath the number of dropped packet within a minute, after ...
1
vote
0answers
90 views

「Netscreen」 VPN UP/DOWN due to loopback address source monitoring

I am dealing with a problem with Netscreen VPN. Topology is basically Server Side ーー> (Agg2)Trust/Untrust(Agg1)ーー> ーー> Remote Office (Yamaha) 100.66.xx.0/24 ーー> Netscreen VPN ーー> Internet ーー> 100....
0
votes
1answer
677 views

Is NAT loopback the only reason I can't view my own website from within my LAN? [closed]

I am new to this so apologies if this is the wrong place for such a question. I'm testing out a simple "hello world" website hosted at home. As we have not been assigned a static IP address by our ...
2
votes
2answers
80 views

Effects of local switch time on network performance

Given a collection of switches all communicating together, will the local time on the switching equipment configuration have any bearing on performance, or just a common reference point when ...
0
votes
1answer
44 views

Troubleshooting server connectivity [closed]

I went for an interview recently and I was asked if a server was experiencing slow file transfer what would you do troubleshoot the issue? The could only think of checking speed/duplex. What else can ...
0
votes
3answers
117 views

Is a high TCP retransmittal % a conclusive indication of congestion?

I have a web server who's perfmon stats report a TCP retransmittal rate of about 10%. I also have a client who makes heavy use of this server reporting poor performance. The performance problems ...
0
votes
1answer
68 views

Simple way to monitor network performance w/o access to network infrastructure?

I work for a large organization where the network team is in some disarray (key people left/fired, etc.). My team is responsible for the performance of various client/server applications which of ...
4
votes
2answers
8k views

How to configure Internet Port and Public IP settings on the CISCO Meraki Z1?

What exactly do the Internet Port and Public IP settings mean on the CISCO Meraki Z1 gateway? Context Note: this is a detailed explanation with images - I apologize for its length but I'm striving ...
4
votes
3answers
520 views

How can I know about if there is a smurf attack on my network?

I have been having network issues. The users report to me problems with the internet, but actually the problem is on my network. I have a sonicwall firewall and the device logs indicate posible tcp ...
-1
votes
2answers
202 views

network problems

I am having a problem with my network. I have a router (R1) connected to another router (R2) R1 is connected to a switch. R1 switch has two PC's connected to it. the PC IP's are 128.107.35.10 and 192....
4
votes
1answer
1k views

How to troubleshoot reason why ARP replies from ISP are not forwarded through our switch?

At one of our offices, a new ISP recently installed an Internet connection via Radwin microwave radios, going to an E1 line back to the capital where their routing equipment is. There is a very ...
7
votes
3answers
5k views

Edit Cisco IOS ACL without hanging the router

I have a Cisco Router 1941 Series and I want to make some changes to the access-list on the router. I got to know I will have to delete one of the list and then re-add everything again with my ...
1
vote
1answer
242 views

Allow outgoing connections

I have an Arista switch (EOS) and I'm having trouble allowing outgoing connection from the switch to the outside. Using tcpdump I can see that no packets are being allowed. This has an impact on DNS ...
6
votes
4answers
16k views

How do I pinpoint bandwidth consumers on my Fortigate?

For a long time now we've been having huge connection problems at work. The Internet connection is bad, for sure, but I don't think they are the main problem, they don't see any packet loss on their ...
6
votes
2answers
5k views

Juniper EX2200 can't boot

I recently acquired a Juniper EX2200-24T-4G switch, but I have some issues getting it up and running. When I power on the switch the boot process looks normal, but after some time it suddenly turns ...
-2
votes
1answer
78 views

Does the bandwidth of a Comcast modem divide if it is connected to two routers on two subnets? [closed]

I have a 150 megabits/sec Comcast pipe that connects to two subnets through two Cisco routers. The bandwidth at the modem is 150 Mb/s. The bandwidth at one router is 96 Mb/s and the other is 96 Mb/s ...
1
vote
1answer
84 views

Question about graceful restart

i do some research on graceful restart for OSPF, BGP, LDP. After i read those RFCs for these protocols, i have a question want to ask that if a router really goes down not restart (i.e. power off...), ...