> Source: [sk168695](https://support.checkpoint.com/results/sk/sk168695)

# sk168695 - ISP redundancy does not work after an upgrade

| Property | Value |
|----------|-------|
| Solution ID | sk168695 |
| Date Created | 2020-08-17 |
| Last Modified | 2020-08-31 |
| Technical Level | Advanced |
| Products | Security Gateway |
| Versions | R82.10, R82, R81.20 |

## Symptoms

- * ISP Redundancy is configured properly in Load Sharing mode, but does not work after an upgrade.

* When ISP Redundancy configured in Load Sharing mode, outgoing connections only pass through primary ISP. When running kernel debug ('fw ctl zdebug + misp conn vm drop')
  the following logs are seen for the relevant connection:  
  `
  @;2398531;[vs_0];[tid_1];[fw4_1];misp_rt_chain: Entering`  
  `
  @;2398531;[vs_0];[tid_1];[fw4_1];misp_rt_chain: IPP(6): a.a.a.a (10000) -> b.b.b.b (443);`  
  `
  @;2398531;[vs_0];[tid_1];[fw4_1];misp_rt_chain: End. Attached new route to packet;`  
  `
  @;2398531;[vs_0];[tid_2];[fw4_2];misp_rt_chain: Entering;`  
  `
  @;2398531;[vs_0];[tid_2];[fw4_2];misp_rt_chain: IPP(17): c.c.c.c (22466) -> 10.133.171.148 (53773);`  
  `
  @;2398531;[vs_0];[tid_2];[fw4_2];misp_rt_chain: Doing nothing. cdir is 2.;`  
  `
  @;2398531;[vs_0];[tid_1];[fw4_1];misp_rulematch: Entering;`  
  `
  @;2398531;[vs_0];[tid_1];[fw4_1];misp_rulematch: IPP(6): d.d.d.d (56013) -> b.b.b.b (443);`  
  `
  @;2398531;[vs_0];[tid_1];[fw4_1];misp_rulematch: Already decided;`  
  `
  @;2398531;[vs_0];[tid_1];[fw4_1];Caller : misp_rulematch;`  
  `
  @;2398531;[vs_0];[tid_1];[fw4_1];KBUF : 2860324865;`  
  `
  @;2398531;[vs_0];[tid_1];[fw4_1];Dir : 1 (MISP_OUTBOUND);`  
  `
  @;2398531;[vs_0];[tid_1];[fw4_1];ISP-ID : 0;`  
  `
  @;2398531;[vs_0];[tid_1];[fw4_1];Route KBUF: 464306177;`

* Disabling SecureXL *(# fwaccel off)* as a troubleshooting step, does not resolve the issue.

## Cause

Due to calculations, the operation system may return a wrong route for the second ISP link.

## Solution

This solution requires authentication. Please log in to view the full solution.

---

# Agent Instructions

This content is from the Check Point Support Center (https://support.checkpoint.com), the official knowledge base for Check Point cybersecurity products.

## Navigating This Knowledge Base

- **Complete index**: [llms.txt](https://support.checkpoint.com/llms.txt)
- **All SK articles**: [SecureKnowledge Sitemap](https://support.checkpoint.com/sitemaps/secureknowledge-sitemap-index.xml)
- **SK article URL pattern**: `https://support.checkpoint.com/results/sk/{skId}`
- **Markdown responses**: AI bot User-Agents automatically receive `text/markdown` content