# [LIBDFWD_FILTER_MATCH_PREFIX_ERR](https://apps.juniper.net/syslog-explorer/?msg=LIBDFWD_FILTER_MATCH_PREFIX_ERR)

## SYSLOG Details
- **Message**: "prefix" or "prefix_len" <variable>prefix-length</variable> bad.
- **Help**: Prefix or prefix length is invalid
- **Description**: libdfwd found an error while checking filter match prefix. either the prefix or the prefix length is invalid. Address/0 is invalid. All other combinations (address/prefix, 0/prefix & 0/0) are valid.
- **Type**: Error: An error occurred
- **Severity**: error
- **Cause**: -
- **Action**: Prefix configured under filter match is incorrect. Please correct as per the description.
- **Attributes**: prefix-length
- **Facility**: LOG_DAEMON

## Found this message in the following releases:
- [Junos OS 26.2R1](https://apps.juniper.net/syslog-explorer/?msg=LIBDFWD_FILTER_MATCH_PREFIX_ERR&sw=Junos%20OS&rel=26.2R1)
- [Junos OS 25.4R1](https://apps.juniper.net/syslog-explorer/?msg=LIBDFWD_FILTER_MATCH_PREFIX_ERR&sw=Junos%20OS&rel=25.4R1)
- [Junos OS 25.2R2](https://apps.juniper.net/syslog-explorer/?msg=LIBDFWD_FILTER_MATCH_PREFIX_ERR&sw=Junos%20OS&rel=25.2R2)
- [Junos OS 25.2R1](https://apps.juniper.net/syslog-explorer/?msg=LIBDFWD_FILTER_MATCH_PREFIX_ERR&sw=Junos%20OS&rel=25.2R1)
- [Junos OS 24.4R2](https://apps.juniper.net/syslog-explorer/?msg=LIBDFWD_FILTER_MATCH_PREFIX_ERR&sw=Junos%20OS&rel=24.4R2)
- [Junos OS 24.4R1](https://apps.juniper.net/syslog-explorer/?msg=LIBDFWD_FILTER_MATCH_PREFIX_ERR&sw=Junos%20OS&rel=24.4R1)
- [Junos OS 24.2R2](https://apps.juniper.net/syslog-explorer/?msg=LIBDFWD_FILTER_MATCH_PREFIX_ERR&sw=Junos%20OS&rel=24.2R2)
- [Junos OS 24.2R1](https://apps.juniper.net/syslog-explorer/?msg=LIBDFWD_FILTER_MATCH_PREFIX_ERR&sw=Junos%20OS&rel=24.2R1)
- [Junos OS 23.4R2](https://apps.juniper.net/syslog-explorer/?msg=LIBDFWD_FILTER_MATCH_PREFIX_ERR&sw=Junos%20OS&rel=23.4R2)
- [Junos OS 23.4R1](https://apps.juniper.net/syslog-explorer/?msg=LIBDFWD_FILTER_MATCH_PREFIX_ERR&sw=Junos%20OS&rel=23.4R1)
- [Junos OS 23.2R2](https://apps.juniper.net/syslog-explorer/?msg=LIBDFWD_FILTER_MATCH_PREFIX_ERR&sw=Junos%20OS&rel=23.2R2)
- [Junos OS 23.2R1](https://apps.juniper.net/syslog-explorer/?msg=LIBDFWD_FILTER_MATCH_PREFIX_ERR&sw=Junos%20OS&rel=23.2R1)
- [Junos OS 22.4R3](https://apps.juniper.net/syslog-explorer/?msg=LIBDFWD_FILTER_MATCH_PREFIX_ERR&sw=Junos%20OS&rel=22.4R3)
- [Junos OS 22.4R2](https://apps.juniper.net/syslog-explorer/?msg=LIBDFWD_FILTER_MATCH_PREFIX_ERR&sw=Junos%20OS&rel=22.4R2)
- [Junos OS 22.4R1](https://apps.juniper.net/syslog-explorer/?msg=LIBDFWD_FILTER_MATCH_PREFIX_ERR&sw=Junos%20OS&rel=22.4R1)
- [Junos OS 22.2R3](https://apps.juniper.net/syslog-explorer/?msg=LIBDFWD_FILTER_MATCH_PREFIX_ERR&sw=Junos%20OS&rel=22.2R3)
- [Junos OS 22.2R2](https://apps.juniper.net/syslog-explorer/?msg=LIBDFWD_FILTER_MATCH_PREFIX_ERR&sw=Junos%20OS&rel=22.2R2)
- [Junos OS 22.2R1](https://apps.juniper.net/syslog-explorer/?msg=LIBDFWD_FILTER_MATCH_PREFIX_ERR&sw=Junos%20OS&rel=22.2R1)