Connect. Secure. Manage.
Network Packet Analysis
Use authorised packet captures to investigate intermittent faults, retransmissions and protocol failures while controlling access to sensitive traffic data.
Devices supported
across the UK
Client locations
supported
Traffic handled
at peak time
Average
response time
Average response is not a resolution time or a contractual guarantee. Support scope and response commitments are agreed for each engagement.
Network packet analysis uses selected traffic to answer a specific question about a fault. We use captures in Cisco and Meraki investigations when logs and normal checks cannot explain the behaviour. The capture point and scope are defined first. The aim is evidence about what passed that point, with a clear link to the issue being investigated.
A useful question might concern a failed connection, intermittent retransmission, unexpected app exchange or missing traffic between two network boundaries. We agree that question first, because it determines where to observe, what to collect and how much evidence is necessary.
A clear requirement
Turn the business need into a practical network scope with visible dependencies.
A controlled delivery
Plan implementation, testing and rollback before production changes begin.
A supportable result
Leave useful records, ownership and escalation routes behind.
Define what the capture needs to prove
Packet analysis is most useful when competing explanations can be tested. For example, we may need to establish whether a request left one segment, whether a reply returned or whether the two observations describe the same transaction.
We distinguish the evidence available at an observation point from the behaviour of the whole app. Traffic visible at one interface does not on its own establish what a remote endpoint processed or why an app made a particular decision.
The investigation plan identifies useful timestamps, test clients and the expected behaviour. Without that context, a technically valid capture can still be difficult to interpret.
Standards & partnerships
Confidence in the team behind your network.
Cisco Partner
Cisco Meraki
Cyber Essentials
Cyber Essentials PlusMCI Network Services is operated by Proxar Ltd. Certifications apply to the certified legal entity and the scope of its certificates. View accreditation information
Choose observation points carefully
The relevant path may cross switches, firewalls, tunnels or provider handoffs. We select observation points according to the question and the access available, checking whether the chosen method can capture the traffic of interest reliably.
Capture methods can have practical limits. The observation arrangement, traffic volume and device capability need to be understood before treating an apparent absence as conclusive evidence that a packet was never forwarded.
Where several captures are compared, timing and identification matter. We record how observations were collected and any limitations that could affect the sequence being reconstructed, rather than present a more precise timeline than the evidence supports.
A useful starting point
Tell us what is happening.
A short description of the problem is enough for an initial discussion.
Protect the information being collected
Traffic captures can contain confidential or personal information, authentication material and details about your internal setup. Collection therefore requires clear authority, a defined purpose and appropriate handling arrangements.
We agree filters, duration, access and retention for the investigation. Reducing unnecessary collection can make the result both easier to analyse and less sensitive to share.
Captured traffic should not be uploaded through a public website form or distributed indiscriminately between suppliers. Where evidence must be shared, we identify the relevant portion and use an approved transfer route with the appropriate recipients.
Different environments. The same care.
Built around the work
your network supports.
Finance, banking and the wider private sector. We start with the systems and people that depend on your connections.
Finance & banking
Market-data paths, routing and provider coordination on clients’ behalf.
Financial-market services ↗Offices & multi-site teams
Reliable access between people, workplaces and business applications.
Office network design ↗Data centres & cloud
Network boundaries, workload connections and operational ownership.
Data centre networks ↗Relate observations to the network and application
The analysis connects packet behaviour with device setup, counters and app evidence where available. A retransmission or delayed response can be an important observation without, by itself, proving which component caused the underlying condition.
Encrypted traffic may still provide useful connection and timing information, but visibility into protected app content depends on the authorised observation arrangement. We do not promise to decode every app or bypass encryption as part of a routine support investigation.
Findings distinguish what was directly observed, what can reasonably be inferred and what remains untested. That separation gives the next technical team a reliable basis for action.
Use the findings to guide a controlled change
A packet investigation should end with a useful conclusion or a clearly narrowed question. Recommended actions are tied to the evidence rather than to a generic preference for changing timeout, buffer or security settings.
Where a change is approved, a repeatable test helps compare before and after behaviour. Improvement should be assessed against the original symptom, not just a reduction in one counter that may be unrelated to the business problem.
For ongoing incidents, third-line support can coordinate the wider work. After a major event, root cause analysis can incorporate the packet findings into a broader account of causes and prevention.
Packet analysis questions
Can you analyse an existing capture?
We can assess its usefulness when collection authority and secure transfer are established. The capture point, timing, filters and original symptom are essential context. A file without those details may support only limited conclusions, even when the packets themselves are readable.
Does packet loss in a capture always mean the network dropped traffic?
No automatic conclusion should be drawn. The observation method and its limitations must be considered alongside other evidence. The investigation needs to distinguish an actual forwarding problem from incomplete visibility at the collection point.
Will you need access to application data?
Not necessarily. Some questions can be answered from connection information and headers. We agree the minimum evidence needed and explain when limited visibility prevents a stronger conclusion, rather than collect sensitive content without a defined reason.
How do we request a focused investigation?
Use our contact page to describe the symptom and the network boundaries involved. Do not attach captures or credentials to the initial enquiry. We can then establish scope, authority and a suitable evidence-handling route.
Talk to a specialist
Need a specialist view?
Tell us what is affected, what changed and what your team has already checked. A short outline is enough to start.
+44 203 196 6566Choose option 1
sales@proxar.co.ukUK-wide service.
Most of our engineers are based in Kent, with a focus on London, Sussex, Essex and Berkshire.
Existing customers should use their agreed support and escalation channels. This form is for service enquiries, not a monitored emergency ticket.
Tell us what you need.
A short outline is enough. Please do not include passwords or sensitive network details.
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